Doepfer

Doepfer A-101-6 Six Stage Opto FET VCF

A-101-6 is a new filter module that uses so-called opto FETs to control the filter frequency. Opto FETs are very similar to Vactrols but use light depending field effect transistors (FETs)…

This is the first vactrol based module in the A-100 system. A vactrol is a combination of a light depending resistor (LDR) and a LED (light emitting diode) both put into a small light-proof case. For more general details about…

Doepfer A-101-1v Vactrol Multitype Filter (vintage)

This is the first vactrol based module in the A-100 system. A vactrol is a combination of a light depending resistor (LDR) and a LED (light emitting diode) both put into a small…

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A-101-2 is a vactrol based combination of Low Pass filter (LP) and VCA and was inspired by the Buchla module 292. The term "Low Pass Gate" was created by Don Buchla and stands for a module that can be switched between low pass and…

A-101-2v is a vactrol based combination of Low Pass filter (LP) and VCA and was inspired by the Buchla module 292. The term "Low Pass Gate" was created by Don Buchla and stands for a module that can be switched between low pass…

Module A-101-3 is a 12 stage phase shifter with vactrols as phase shifting elements. Vactrols are known for their smooth sound behaviour. For more general details about vactrols please look at the Vactrol Basics page.
In contrast…

Doepfer A-101-8 Photo Phasing

Module A-101-8 is a 8-stage phase shifter which uses light-sensitive resistors (LDR) and is a replica of the Compact Phasing A manufactured by the company Schulte in the seventies. The actual phasing…

Doepfer A-101-8V Photo Phasing

Module A-101-8 is a 8-stage phase shifter which uses light-sensitive resistors (LDR) and is a replica of the Compact Phasing A manufactured by the company Schulte in the seventies. The actual…

(In Doepfer Bag, no box)

Module A-102 is a reproduction of the legendary low pass filter design that uses diodes in the filter stage as frequency controlling elements resulting in "strange" resonance behaviour and frequency…

Module A-103 is a voltage controlled low pass filter with 18dB/octave slope. The circuit is based on a modified transistor ladder (Moog ladder) and is a reproduction of the legendary TB303 filter.

As for the rest the A-103 is…

A-104 is a fourfold formant filter as used in the Mixtur Trautonium by Oskar Sala. It is made of four parallel resonance filters, each filter can be switched to low pass or band pass or off. Frequency, resonance and level are…

Doepfer A-105-2 24dB SSI Low Pass Filter

Module A-105-2 is a voltage controlled low pass filter with 24dB/octave slope. It is the successor of the A-105 which had to be discontinued because the obsolete SSM2044 filter circuit.…

Doepfer A-105-2V 24dB SSI Low Pass Filter (black)

Module A-105-2 is a voltage controlled low pass filter with 24dB/octave slope. It is the successor of the A-105 which had to be discontinued because the obsolete SSM2044 filter…

Doepfer A-105-4 Quad Poly VCF

A-105-4 is Doepfers first polyphonic filter and contains four identical 24dB Lowpass filters (SSM2044 type). It has available common manual controls and CV inputs with attenuators for these…

(In Doepfer Bag, no box)

Module A-106-1 has it's origin in our experiments to built a MS20 filter clone. The module is not exactly the same as the MS20 filter but similar. The famous original MS20 included two filters: a 12 dB…

Module A-106-5 is a 12dB multimode filter that is based on the filter circuit of the Oberheim SEM module.The filter is equipped with a band pass output and a combined low/notch/high pass output. For this output a control knob…

Doepfer A-106-5 Special Edition

Module A-106-5 is a 12dB multimode filter that is based on the filter circuit of the Oberheim SEM module.The filter is equipped with a band pass output and a combined low/notch/high pass…

(In Doepfer Bag, no box)

Module A-106-6 is a multimode filter that is based on the filter circuit of the Oberheim Xpander. The module features 15 different filter types (those filters of the A-107 that were available in the…

DOEPFER A-106-6V XP VINTAGE EDITIONModule A-106-6V is a multimode filter that is based on the filter circuit of the Oberheim Xpander. The module features 15 different filter types with 8 filters available simultaneously.

The…

Module A-108 is a completely new voltage-controlled low pass pass filter based on the well-known transistor ladder (Moog ladder). The module has internally an 8 stage low pass filter with different slopes available: 6, 12, 18, 24,…

(In Doepfer Bag, no box)

Doepfer A-110-1 Standard VCO

Module A-110-1 is a voltage-controlled oscillator. This VCO's frequency range is about eight octaves (ca. 15Hz ... 8kHz). It can produce four waveforms simultaneously:…

(In Doepfer Bag, no box)

Doepfer A-110-1V (vintage black edition) Standard VCO

Module A-110-1 is a voltage-controlled oscillator. This VCO's frequency range is about eight octaves (ca. 15Hz ... 8kHz). It can produce four…

Doepfer A-110-2 Basic VCO

Module A-110-2 is a low-cost voltage-controlled oscillator. It's a slightly reduced version of the standard VCO A-110-1. Compared to the A-110-1 the A-110-2 has no sine output and the (expensive) octave…

(In Doepfer Bag, no box)

Doepfer A-110-2V (vintage black edition) Basic VCO

Module A-110-2 is a low-cost voltage-controlled oscillator. It's a slightly reduced version of the standard VCO A-110-1. Compared to the A-110-1 the…

(In Doepfer Bag, no box)

Doepfer A-110-4 Quadrature VCO

A-110-4 is a so-called Thru Zero Quadrature VCO. The term "quadrature" means in this connection that the oscillator outputs sine and cosine waveforms simultaneously. The…

Doepfer A-110-4SE QAD VCO Special Edition Blue-White

A-110-4 is a so-called Thru Zero Quadrature VCO. The term "quadrature" means in this connection that the oscillator outputs sine and cosine waveforms simultaneously. The term…

Doepfer A-110-6 Trapezoid Thru Zero Quadrature VCO

A-110-6 is a Trapezoid Thru Zero Quadrature VCO. The module is based on an idea by Donald Tillman from 2003 but has been revised for the use of modern electronic circuits.
The…

Doepfer A-111-2 High end VCO II

The successor of the A-111 High End oscillator is an utterly precise analog VCO/LFO with a extremely big frequency range, immaculate tracking over at least ten octaves and nearly perfect…

Doepfer A-111-2v High end VCO II

The successor of the A-111 High End oscillator is an utterly precise analog VCO/LFO with a extremely big frequency range, immaculate tracking over at least ten octaves and nearly perfect…

Doepfer A-111-3 Micro Precision VCO

The Micro Precision VCO is a space-saving and utterly precise analog VCO/LFO with a extremely big frequency range, immaculate tracking over at least ten octaves and nearly perfect…

Doepfer A-111-3V Vintage

The Micro Precision VCO is a space-saving and utterly precise analog VCO/LFO with a extremely big frequency range, immaculate tracking over at least ten octaves and nearly perfect waveforms. Basically it…

Doepfer A-111-4 Quad VCO

A-111-4 contains four precision VCOs and has individual controls, inputs and outputs for each VCO available as well as a common control and output unit. After all the A-111-4 is very similar to four…

Doepfer A-111-4v Quad VCO (vintage black)

A-111-4 contains four precision VCOs and has individual controls, inputs and outputs for each VCO available as well as a common control and output unit. After all the A-111-4 is very…

Doepfer A-111-5 Synthesizer Voice (AS3394)

Module A-111-5 was out of production many years as the special circuit CEM3394 used as core of the module was no longer available. Now a clone of the CEM3394 is available…

DOEPFER A-111-5V SYNTHESIZER VOICE VINTAGE (AS3394) The A-111-5V is a monophonic synthesizer voice in Eurorack format. The entire sound generation and all modulation sources are 100% analog. Basically it is a Dark Energy without…

DOEPFER A-111-6 MINIATURE SYNTHComplete miniature synthesizer voice module

VCO

∙ triangle core VCO
∙ manual tune control and octave switch
∙ modulation input for frequency (FM) or pulsewidth modulation (PM)
∙ manual…

DOEPFER A-111-6V MINIATURE SYNTH (BLACK)

Complete miniature synthesizer voice module

VCO

∙ triangle core VCO
∙ manual tune control and octave switch
∙ modulation input for frequency (FM) or pulsewidth modulation (PM)
∙…

(In Doepfer Bag, no box)

Module A-112 is the combination of a voltage controlled 8 Bit Sampler and a wavetable oscillator. On top of it the module is able to generate some special effects. A-112 was designed as an additional…

(In Doepfer Bag, no box)

Doepfer A-112V Sampler / Wavetable Module (vintage black)

Module A-112 is the combination of a voltage controlled 8 Bit Sampler and a wavetable oscillator. On top of it the module is able to generate…

Module A-113 is a new sound source that derives from an incoming pulse signal four so-called subharmonics (German: Subharmonische). The term subharmonics was introduced by Oskar Sala in connection with his so-called…

(In Doepfer Bag, no box)

Module A-114 contains two separate ring modulators. A ring modulator outputs the product (Multiplication X • Y) of the signals at inputs X and Y. It's similar to a VCA, but whereas a VCA only responds…

(In Doepfer Bag, no box)

Doepfer A-114v Dual ringmod. Vintage Edtion (black)

Module A-114 contains two separate ring modulators. A ring modulator outputs the product (Multiplication X • Y) of the signals at inputs X and Y.…

Module A-115 is a four-way frequency divider. The frequency of a signal at the input is halved (half frequency = first sub-octave), quartered (1/4 frequency = second sub-octave), and so on. In this way, the DIVIDER produces four…

Module A-116 provides voltage-controlled dynamic waveform modification of audio signals. It can produce new waveforms from the standard VCO shapes, and modulate these changes in real time. The signal first of all goes through an…

Module A-117 (DNG) is a combination module, including a digital noise generator and an 808 source.
The digital noise generator uses random sequences of square waves (18 step shift register with multiple feedback), whose rate can…

Doepfer A-117-2 Voltage Controlled Digital Noise

Module A-117-2 contains a digital voltage controlled noise generator. It produces random sequences of square pulses whose rate can go from random clicks to audible noise. The…

Module A-118 is (as you might have guessed) a noise and random voltage generator. It produces three types of signal: white noise, colored noise, and random voltage.
White and colored noise can be used as audio sources, and also,…

(In Doepfer Bag, no box)

Doepfer A-118V Noise / Random (vintage black)

Module A-118 is (as you might have guessed) a noise and random voltage generator. It produces three types of signal: white noise, colored noise, and random…

DOEPFER A-118-2 NOISE / RANDOM / T&H / S&HModule A-118-2 generates the signals white noise, colored noise, continuous random voltage and stepped random voltage. The noise signal is generated 100% analog by amplification of the…

DOEPFER A-118-2V NOISE / RANDOM / T&H / S&H VINTAGE EDITIONModule A-118-2V generates the signals white noise, colored noise, continuous random voltage and stepped random voltage.

The noise signal is generated 100% analog by…

Module A-119 (External Input / Envelope Follower) is designed to allow external audio signals to be integrated into the System A-100. It comprises a pre-amp, envelope follower, and comparator.
The pre-amp has two inputs: an…

DOEPFER A-119V EXTERNAL INPUT / ENVELOPE FOLLOWER VINTAGEModule A-119V (External Input / Envelope Follower) is designed to allow external audio signals to be integrated into the System A-100. It comprises a pre-amp, envelope…

Module A-120 is a voltage controlled low-pass filter, which filters out the higher parts of the sound spectrum, and lets lower frequencies pass through. The Cut-Off Frequency determines the point at which filtering takes effect.…

(In Doepfer Bag, no box)

Doepfer A-120v 24dB Low Pass Vintage Edition (black)

Module A-120 is a voltage controlled low-pass filter, which filters out the higher parts of the sound spectrum, and lets lower frequencies pass…

Doepfer A-121d Dual Multimode Filter

Module A-121s is a special dual multimode filter which can be used for parallel or serial organized dual mono filters. Even stereo applications are imaginable. The filter are based on two…

Doepfer A-121dV Dual Multimode Filter (black)

Module A-121s is a special dual multimode filter which can be used for parallel or serial organized dual mono filters. Even stereo applications are imaginable. The filter are based on…

Doepfer A-121s Stereo Multimode Filter

Module A-121s is a dual multimode filter which can be used for stereo applications as well as for parallel or serial organized dual mono filters. The core is a 12dB multimode filter…

Doepfer A-121sV Stereo Multimode Filter Black

Module A-121s is a dual multimode filter which can be used for stereo applications as well as for parallel or serial organized dual mono filters. The core is a 12dB multimode filter…

Doepfer A-121-2 Multi mode filter

Module A-121 is a voltage-controlled multi-mode filter with a cut-off slope of -12 dB / octave. Four simultaneous outputs are available, each with different characteristics: low-pass, band-pass,…

Doepfer A-121-2V Multi mode filter (vintage black

Module A-121 is a voltage-controlled multi-mode filter with a cut-off slope of -12 dB / octave. Four simultaneous outputs are available, each with different characteristics:…

DOEPFER A-121-3 MICRO VCFModule A-121-3 is functionally nearly identical to module A-121-2. Only the distances between the controls and sockets are smaller and rubberized, small rotary knobs are used. Therefore the front panel…

Doepfer A-123-2 6/12/18/24 dB Highpass

A-123-2 is a voltage controlled highpass filter with four filter outputs (6, 12, 18 and 24dB slope). It also features voltage control of the resonance.

These controls and in/outputs are…

Module A-124 is a special 12dB multimode filter using the "strange" filter circuit of the "EDP Wasp" (an analog synthesizer with black/yellow case built end of the seventies, manufactured by the UK company "Electronic Dream…

Doepfer A-124 SE Wasp Filter (Black & Yellow special edition)

Module A-124 is a special 12dB multimode filter using the "strange" filter circuit of the "EDP Wasp" (an analog synthesizer with black/yellow case built end of the…

Doepfer A-124-2 Wasp Filter

Module A-124-2 is the slim version of the Wasp filter module A-124.
The main difference compared to the A-124 are the small controls for Mix and Input Level because for lack of space. And the lowpass…

Doepfer A-124-2SE Wasp Filter black/yellow Slim Line

Module A-124-2 is the slim version of the Wasp filter module A-124.
The main difference compared to the A-124 are the small controls for Mix and Input Level because for lack of…

Module A-125 (VC Phaser) is a voltage controlled phase shifter.
Phase shifting can be controlled either manually or by voltage control.
Other parameters which can be controlled are resonance (governing the depth of the comb…

Doepfer A-126-2 Voltage Controlled Frequency Shifter II

(Board A is version one with pin out for Envelope out)

Module A-126-2 is a fully analog frequency shifter for audio signals. A frequency shifter is an audio processing unit…

Doepfer A-126-2 expander

The Doepfer A-126-2exp is an expander for the A-126-2 Voltage Controlled Frequency Shifter.

It adds two outputs from the Dome filter (+45 and -45 degrees) as well as separate outputs from the ring…

Doepfer A-126-2v Voltage Controlled Frequency Shifter II (black vintage edition)

(Board A is version 2, with all the in- and outputs)

Module A-126-2 is a fully analog frequency shifter for audio signals. A frequency shifter is…

Doepfer A-126-2 expanderV

The Doepfer A-126-2expV is an expander for the A-126-2V Voltage Controlled Frequency Shifter.

It adds two outputs from the Dome filter (+45 and -45 degrees) as well as separate outputs from the ring…

Module A-127 is a triple resonance filter unit. It contains three separate voltage controlled band pass filters. Each filter has it's own LFO (triangle waveform) with LED display and adjustable frequency and amplitude. Instead of…

Module A-128 (Fixed Filter Bank) is a filter bank, made up of 15 parallel band pass filters, all with fixed middle frequencies and bandwidth (50 Hz / 75Hz / 110Hz / 150Hz / 220Hz / 350Hz / 500Hz / 750Hz / 1.1kHz / 1.6kHz / 2.2kHz…

(In Doepfer Bag, no box)

Modules A-130 and A-131 provide voltage-controlled amplification. For audio signals, you would normally use the exponential VCA (A-131), and for control voltages, the linear VCA (A-130). It doesn't always…

DOEPFER A-130-2 MICRO VCAModule A-130-2 is composed of two identical voltage controlled amplifiers (VCA). Each VCA has a manual gain control (also named Initial Gain) and a control voltage input with attenuator. The character of…

DOEPFER A-130-2V MICRO VCA (BLACK)Module A-130-2 is composed of two identical voltage controlled amplifiers (VCA). Each VCA has a manual gain control (also named Initial Gain) and a control voltage input with attenuator. The…

Doepfer A-130-4 Quad VCA

Module A-130-4 contains four linear VCAs with a common level control section for all four VCAs. It can be used for all applications of simultaneous amplitude/level control of up to four different audio or…

Doepfer A-130-8 Octal Linear VCA

Module A-130-8 contains eight linear voltage controlled amplifiers (VCAs). Each VCA features a control voltage input (CV), a signal input (In) and a signal output (Out). In addition three mixers…

Doepfer A-130-8V Octal Linear VCA Vintage black

Module A-130-8 contains eight linear voltage controlled amplifiers (VCAs). Each VCA features a control voltage input (CV), a signal input (In) and a signal output (Out). In addition…

Modules A-130 and A-131 provide voltage-controlled amplification. For audio signals, you would normally use the exponential VCA (A-131), and for control voltages, the linear VCA (A-130). It doesn't always have to be that way,…

new: from June 2013 the module is equipped with high-end VCAs

Module A-132-1 (Dual Low Cost VCA) contains two voltage controlled amplifiers, with a linear response most suited to regulating the level of control voltages (ADSR…

Module A-132-3 is composed of two identical voltage controlled amplifiers (VCA). Each VCA has a manual gain control and a control voltage input with attenuator. The character of the control scale can be switched to linear or…

Doepfer A-132-3v Vintage Edition

Module A-132-3 is composed of two identical voltage controlled amplifiers (VCA).

Each VCA has a manual gain control and a control voltage input with attenuator. The character of the control scale…

(In Doepfer Bag, no box)

Module A-132-4 contains four identical voltage controlled amplifiers (VCA) with exponential control scales. Each VCA has two control voltage inputs (C1, C2), a signal input (In) and a signal output (Out).…

Doepfer A-132-8 Octal VCA

A-132-8 is an octal VCA and primarily planned for polyphonic applications. The module contains four VCA pairs. Each pair includes two daisy-chained VCAs. One VCA has a linear control scale, for the…

A-133 is a special dual voltage controlled amplifier that enables both positive and negative amplifications. Negative amplification means in this context that the signal is inverted. The main application of the module is the…

Doepfer A-133-2 Dual Voltage Controlled Polarizer Slim line

A-133-2 is a special dual voltage controlled amplifier that enables both positive and negative amplifications. Negative amplification means in this context that the…

A-134-1 is a voltage controlled universal panning and/or crossfader module. If the module is used a voltage controlled Panning device one audio signal is panned to two different outputs. If the module is used a voltage controlled…

Module A-134-2 contains two identical voltage controlled crossfader units.

Each unit has two voltage controlled amplifiers (VCAs) with opposite control behaviour available. The outputs of the two VCAs are mixed together to obtain…

Module A-135-1 is a quad voltage controlled mixer. It is made of 4 independent linear VCA's. The VCA outputs are mixed to a common output. For each VCA the following inputs and controls are available: audio input with attenuator,…

Doepfer A-135-2 Mini Quad VCA/Mixer

Module A-135-2 is a miniature version of the A-135-1. It consists of four linear VCAs with mixing function.

The input level is adjusted with the attenuator. The volume control of each input…

DOEPFER A-135-2V VOLTAGE CONTROLLED MIXER VINTAGE EDITIONModule A-135-2V is a miniature version of the A-135-1. It consists of four linear VCAs with mixing function.

The input level is adjusted with the attenuator. The volume…

DOEPFER A-135-3 VOLTAGE CONTROLLER MIXERA-135-3 is a is a voltage controlled stereo mixer with four inputs. Behind a front panel with 8 HP only eight linear VCAs (voltage controlled amplifiers) and the mixer based on the VCAs are…

Doepfer A-135-4A/B VC Performance Mixer

Series A-135-4 contains several modules which are used to built a voltage controlled performance mixer. The modules of the A-135-4 series can be combined with the (non voltage controlled)…

Module A-135 is a distortion and waveshaping module with extensive control possibilities. The incoming audio or cv signal is internally divided into 3 sections:

∙ positive component of the signal with adjustable clipping level…

A-137 is a voltage controlled Wave Multiplier. The basic idea of a wave multiplier is to multiply the waveform of an incoming signal (e.g. triangle/saw/sine from a VCO) within one period of the waveform. This leads to additional…

(In Doepfer Bag, no box)

Module A-137-2 is another version of a wave multiplier. In contrast to the A-137-1 Wavemultiplier I the A-137-2 generates four phase-shifted copies of a VCO signal applied to the audio input. The four…

Module A-138 is a four channel mixer, which can be used with either control voltages or audio signals. Each of the four inputs has an attenuator, and there's a master attenuator, so that the mixer can be used at the end of the…

(In Doepfer Bag, no box)

Doepfer A-138aV Mixer linear (vintage black)

Module A-138 is a four channel mixer, which can be used with either control voltages or audio signals. Each of the four inputs has an attenuator, and there's…

Module A-138 is a four channel mixer, which can be used with either control voltages or audio signals. Each of the four inputs has an attenuator, and there's a master attenuator, so that the mixer can be used at the end of the…

Doepfer A-138bV Vintage black edition

Module A-138 is a four channel mixer, which can be used with either control voltages or audio signals. Each of the four inputs has an attenuator, and there's a master attenuator, so that the…

(In Doepfer Bag, no box)

Doepfer A-138bV Vintage black edition

Module A-138 is a four channel mixer, which can be used with either control voltages or audio signals. Each of the four inputs has an attenuator, and there's a…

(In Doepfer Bag, no box)

Module A-138c is a four channel mixer, that allows to add or to subtract four incoming voltages to the output signal. In the middle position of the corresponding control the amplification is zero. Turning…

Module A-138d can be used in two different ways:

∙ as a crossfader module within the A-100

∙ as an insert module for external effect units (e.g. guitar stomp boxes) with dry/wet control

If the module is used as a crossfader…

Doepfer A-138f Dual Three-Way Crossfader

Module A-138f contains two identical crossfaders with three inputs and one output each. Three different signals are connected to the inputs A, B and C. In the ccw position of the…

DOEPFER A-138I INTERRUPTING MIXERModule A-138i is a four channel mixer with an additional mute switch for each input. On top of that it is equipped with two types of single outputs and a dual mix output. All inputs and outputs are…

Doepfer A-138j - Inverting/Interrupting Mixer (Janus Mixer)

odule A-138j is a four channel mixer with an additional polarity/mute switch for each input. In the upper position of the corresponding switch the inverted signal is…

Module A-138m is a 4 x 4 matrix mixer with switches for unipolar/bipolar mode for each column. Unipolar means that the controls work as attenuators. Bipolar means that the controls work as polarizers. In this mode the…

DOEPFER A-138N NARROW MIXER Module A-138n is a simple four channel mixer, which can be used with either control voltages or audio signals. Each of the four inputs has an attenuator available. The output is twice available (two…

DOEPFER A-138NV NARROW MIXER VINTAGE EDITIONModule A-138n is a simple four channel mixer, which can be used with either control voltages or audio signals. Each of the four inputs has an attenuator available. The output is twice…

Doepfer A-138p Performance Mixer Input

The A-138p input module of the Performance Mixer system has four channels featuring controls for gain, aux send, panorama and output level as well as a mute switch and a peak-LED for the…

Doepfer A-138pv Performance mixer (black vintage)

The A-138p input module of the Performance Mixer system has four channels featuring controls for gain, aux send, panorama and output level as well as a mute switch and a peak-LED…

Doepfer A-138o Performance Mixer Output

The output module of the Performance Mixer system sums all conencted input modules and their channels, controls the final volume as well as separately the aux send and aux return levels…

Doepfer A-138ov (output module) Vintage black

The output module of the Performance Mixer system sums all conencted input modules and their channels, controls the final volume as well as separately the aux send and aux return…

Doepfer A-138s Mini Stereo Mixer

A-138s is a simple but useful 4-in-2 mixing tool.

It has four inputs available. Each input is equipped with an attenuator (Level) and a panning control that is used to distribute the signal to…

Doepfer A-138sv Mini Stereo Mixer (vintage black)

A-138s is a simple but useful 4-in-2 mixing tool.

It has four inputs available. Each input is equipped with an attenuator (Level) and a panning control that is used to distribute…

Doepfer A-139-2 Headphone Amplifier 2

∙ two-channel headphone amplifier

∙ two audio inputs with level controls

∙ Input 1 is normalled to Input 2

∙ common loudness/master level control

∙ headphone output (stereo 1/4"…

Module A-140 is an envelope generator, and, since it puts out control voltages, counts as one of the modulation devices in a modular system. As soon as the gate input receives sufficient voltage, the ADSR generates a variable…