Befaco Percall

Quad percussive VCA with decay envelopes and choke

12 HP Eurorack module

Percall by Befaco is a quad percussive VCA with dedicated decay envelopes, a mixer output, strength (accent) input, and choke functionality. Designed for shaping four sound sources into percussive hits with minimal patching. Audio inputs are normalled (1→2, 3→4) enabling choke behavior between paired channels — perfect for open/closed hi-hat setups.

Features

• 4-channel VCA with built-in decay envelopes
• Choke grouping for hi-hat style interactions
• CV-controllable decay times
• Mix output for combined signal
• Normalized inputs for standalone envelope generator use

Controls & Jacks (35)

• Trig 1— Trigger input for channel 1; fires the built-in decay envelope to open the VCA
• Trig 2— Trigger input for channel 2; fires the built-in decay envelope to open the VCA
• Trig 3— Trigger input for channel 3; fires the built-in decay envelope to open the VCA
• Trig 4— Trigger input for channel 4; fires the built-in decay envelope to open the VCA
• Strength— Amplitude + decay CV control shared by all four envelopes. Normalled to 10V when unpatched.
• IN 1— Audio input for channel 1. Normalled to IN 2.
• IN 2— Audio input for channel 2. Receives IN 1 signal when unpatched.
• IN 3— Audio input for channel 3. Normalled to IN 4.
• IN 4— Audio input for channel 4. Receives IN 3 signal when unpatched.
• Vol 1— Volume control for channel 1.
• Vol 2— Volume control for channel 2.
• Vol 3— Volume control for channel 3.
• Vol 4— Volume control for channel 4.
• Vol LED 1— LED showing the current envelope level and output amplitude of channel 1
• Vol LED 2— LED showing the current envelope level and output amplitude of channel 2
• Vol LED 3— LED showing the current envelope level and output amplitude of channel 3
• Vol LED 4— LED showing the current envelope level and output amplitude of channel 4
• Choke Switch 1-2— When active (up position), channel 1 trigger kills channel 2 envelope. Used for open/closed hi-hat setups.
• Choke Switch 3-4— When active (up position), channel 3 trigger kills channel 4 envelope.
• Decay 1— Controls the decay envelope time for channel 1.
• Decay 2— Controls the decay envelope time for channel 2.
• Decay 3— Controls the decay envelope time for channel 3.
• Decay 4— Controls the decay envelope time for channel 4.
• CV 1— Decay CV input for channel 1.
• CV 2— Decay CV input for channel 2.
• CV 3— Decay CV input for channel 3.
• CV 4— Decay CV input for channel 4.
• ENV Out 1— Envelope output for channel 1. Range 0-10V.
• ENV Out 2— Envelope output for channel 2. Range 0-10V.
• ENV Out 3— Envelope output for channel 3. Range 0-10V.
• ENV Out 4— Envelope output for channel 4. Range 0-10V.
• Out 1— Audio output for channel 1. Removed from mix when patched.
• Out 2— Audio output for channel 2. Removed from mix when patched.
• Out 3— Audio output for channel 3. Removed from mix when patched.
• Out 4/Mix— Summed mix output of all 4 channels. Channels 1-3 are removed from mix when their individual outputs are patched.

How-To Guides

• Basic Drum Mix
• Hi-Hat Choke
• Accented Beats

Explore the interactive Percall panel on BleepDex — tap any control to learn what it does.