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Dual EnvVCA

4ms Company

User Manual 1.0 – October 31, 2022

The

Dual EnvVCA

is a dual analog envelope generator, slew limiter, and VCA. Each of the two

channels are identical and can be used separately or together.

Dual EnvVCA

features:

• Versatile linear envelope generator/LFO

• Low-noise, low-distortion, DC-coupled exponential VCAs

• 100% analog

• Sliders and Range switches control Rise and Fall times from ~1.25ms (800Hz) to > 2 min.

•

Time CV

jack extends time range: ~125

s (8kHz) to ~10 min.

• Independent attenuverters for

Rise

and

Fall

time

• Blue/Red LEDs indicate strength and polarity

•

Cycle

buttons for looping envelopes (LFO)

•

Trigger

input jacks fire a one-shot envelope

•

Cycle

gate input jack toggles cycling for both channels

•

EOR/F

(End of Rise/Fall) gate outputs can be used to chain and sequence events

•

Env Level

and

Offset

knobs scale and shift

Env Out

without changing VCA volume

•

Audio In

and

Out

jacks for passing audio or CV through the VCA

•

VCA CV

inputs to use VCAs independently from the envelopes

•

VCA gain internally connected to envelope output when

VCA CV

jack is left unpatched

•

Follow

input jacks allow for slew limiting, sustain (ASR), and exotic filtering effects

• Re-trig jumpers allow for re-triggering during rise phase

Rise

Fall

Rise

Fall

Rise

Fall

Level

Rise

Fall

Cycle

Follow

Trigger

Time CV

Rise

Fall

Time CV

EOR

Fall

Rise

Level

Offset

Slow

Fast

Slow

Fast

Audio B

Out

Audio A

VCA CV

Trigger

EOF

ENV

OUT

Env

Out

Slow

Fast

Med

Slow

Fast

Med

Dual EnvVCA

Содержание EnvVCA

Страница 1: ...lope Cycle gate input jack toggles cycling for both channels EOR F End of Rise Fall gate outputs can be used to chain and sequence events Env Level and Offset knobs scale and shift Env Out without changing VCA volume Audio In and Out jacks for passing audio or CV through the VCA VCA CV inputs to use VCAs independently from the envelopes VCA gain internally connected to envelope output when VCA CV ...

Страница 2: ...Utility Patches 12 Attenuator 12 Trigger Delay with Pulse Width control 12 Inverted Trigger Delay With Pulse Width Control 12 DC generator Manual CV 12 Creating Envelopes Trigger Cycle Follow 13 Triggering with RETRIG Jumper Off Factory Default 13 Triggering with RETRIG Jumper On 13 Cycle Button Jack 13 Follow Jack with Gates 14 Fundamentals of the Follow Jack 14 Sidechaining Envelope Following 15...

Страница 3: ...ake the channel cycle for as long as the gate is held high If a Cycle button is on then a gate signal will turn the button off and cease any cycling for as long as the gate is held high See Cycle Button Jack on page 13 for more information Rise Fall Sliders The Rise and Fall sliders control the rise and fall times of the envelope Shifting a slider up makes the rise or fall portion slower shifting ...

Страница 4: ...outputs the highest voltage value between the two at any given moment The lights near each jack indicate the amplitude and polarity of each envelope When the envelope is somewhere between 0V and 10V its respective light will shine blue When the envelope is somewhere between 10V and 0V the light will shine red The brightness of each light indicates the amplitude of the outgoing signal so when the l...

Страница 5: ...nvelope If there is no envelope in progress then a trigger will initiate a single complete envelope If the envelope is rising when a trigger is received then the trigger is ignored unless the RETRIG jumper is installed see below If the envelope is falling when a trigger is received it will begin rising from its current voltage On the back of the module is a RETRIG jumper for each channel When this...

Страница 6: ...s the fall time can be made much slower than the rise time Typically the rise time is limited to about five minutes while the fall time can go up to 20 minutes or up to an hour on some units Page of 6 20 Switch Position Slider Range total env time Max Range with CV total env time Use Cases Slow 5 min to 1 5 sec 30 min to 300Hz Gradual slow fades or modulation changes occurring over the course of a...

Страница 7: ... Making Notes in Stereo So far we ve just used Channel A but this patch can be duplicated on Channel B to process two sound sources or a single stereo sound source Try doing this now by patching the second output of the Ensemble Oscillator or some other sound source into the Audio In B jack If you don t have another sound source you could leave Audio In B unpatched and the signal from In A will be...

Страница 8: ...rol the envelopes Adding Chaos You can create some inter related pattens by patching Channel A s EOR jack into Channel B s Trigger jack leaving EOF patched to Channel A s Trigger jack and turning off both Cycle buttons Now both channels trigger each other For some extra chaos patch the Env Out OR jack to one of the Time CV jacks and patch the EOR jack into the Cycle jack instead of channel B s Tri...

Страница 9: ... the previous patch it s hard to specify the exact relationship between the base tempo of Channel A and Channel B Using a clock divider module such as the RCD or QCD can give us more control Unpatch the cable from EOF to Time CV Turn off Channel A s Cycle and patch the clock divider s undivided output to Channel A s Trigger jack Adjust the speed of the clock divider to set the base tempo Next patc...

Страница 10: ... will change the amount the pitch rises typically for a classic analog kick sound the knob should be around 1 or 2 o clock The Rise and Fall sliders of Channel B will adjust the attack and decay A typical drum will have a sharp attack and slower decay so start with the Rise slider and switch at Fast and the Fall slider and switch in the middle positions An exponential modulation curve makes a more...

Страница 11: ...B The external oscillator will be amplitude modulated AM with the synth drum sound and this resulting sound will be VCA ed with Channel B s envelope Play with Channel A s sliders and Rise Fall CV knobs to hear the range of possible sounds Next use any of the Env Out jacks to modulate the external oscillator in time with the synth sound Try adding slight modulation to the Time CV of Channel B to cr...

Страница 12: ... will bleed into the attenuator output Trigger Delay With Pulse Width Control Turn Channel A s Cycle off Send a trigger into Channel A s Trigger jack Take the output from EOR Adjust the Rise slider and switch to set the trigger delay time rising edge of incoming trigger to rising edge of outgoing trigger Set the Fall slider and switch to control the width of the outgoing trigger Inverted Trigger D...

Страница 13: ...mper is not installed by default Cycle Button Jack The Cycle button is a simple way to initiate an envelope When the button is on envelopes will cycle continuously The button is latching so pressing it once will make the module output envelopes until you press the button again Once an envelope begins pressing the Cycle button again will not immediately stop the envelope Instead the envelope will s...

Страница 14: ... Follow jack will cause the envelope to rise Sending a low voltage 0V will cause it to fall This can be seen in Figure 6 of the previous section Sending voltages between 0V and 5V such as a waveform from an LFO or an audio signal will have more complex effects There are two basic rules that govern this jack Rule 1 If the voltage on the Follow jack is greater than the envelope voltage the envelope ...

Страница 15: ...always needs to be between 1 00 and 3 00 If it s too low the output will be too quiet and if it s too high the output will be at maximum volume with very little ducking Audio Filter The Follow jack can be used as an exotic audio low pass filter by taking advantage of its slew limiting properties First the audio signal must be shifted up such that it s within the range of 0V to 5V Typically a level...

Страница 16: ...he Sustain portion Alternatively you can use a keyboard instead of Channel B s EOF jack Patch the gate output into Channel A s Trigger and Follow jacks Tapping a key quickly will result in a staccato note while holding the key down longer will result in a longer note Keep in mind that the minimum note length will always be determined by Channel A s rise and fall time parameters no matter how short...

Страница 17: ...ted by an external module such as a keyboard or sequencer that lets you control the pulse width The pulse width determines the length of the sustain that is the ADSR envelope will do the attack and decay segments and then hold at the sustain level until the gate goes low At that point it ll do the release segment Use a mult or stackable cable to patch the gate signal into Channel A s Trigger jack ...

Страница 18: ...Channel B s Follow jack Now you can use the Fall CV knob to set the decay time relative to the release time Turning it to the left of center will make the decay time faster than the release time and vice versa The reason this works is that the decay stage occurs while the gate is high and the release stage occurs when the gate is low Since the gate is patched into the Time CV jack the position of ...

Страница 19: ...tarting place is to set Offset to the center and Level to around 3 00 or higher RETRIG Jumper The RETRIG jumper on the back of the module changes the Dual EnvVCA s behavior when it receives a trigger while an envelope is already running When the jumper is not installed factory default triggers received as the envelope is rising will be ignored and triggers received while the envelope is falling wi...

Страница 20: ...8kHz max frequency Maximum rise time 10 minutes typically 13 minutes Maximum fall time 20 minutes typically 40 minutes Jacks Env jack Min 10 2V Max 10 1V Envelope Max amplitude 9 3Vpp Trigger jack rising edge threshold 2 5V Cycle jack rising edge threshold 2 5V Follow jack active range 0V to 5V EO jacks EOR channel A 80mV low to 4 50V high gate output EOF channel B 80mV low to 4 95V high gate outp...

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