ALM Busy Circuits Pip Slope
Snappy 4HP envelope generator with CV and looping
4 HP Eurorack module
Pip Slope is a compact 4HP envelope generator capable of both Attack/Decay and Attack/Sustain/Decay envelope shapes, with voltage control over attack and decay times. It offers self-looping for LFO-style cycling, switchable exponential and linear curves, and extremely snappy attack times down to sub-1ms, making it equally suited to percussive transients and slow evolving pads.
Features
- Compact 4HP form factor
- Attack/Decay envelope via Trigger Input
- Attack/Sustain/Decay envelope via Gate Input
- Voltage control of attack and decay times (0-5v CV inputs)
- CV input knobs act as attenuators when CV is patched
- Sub 1ms to approximately 100 second time range
- Self-looping mode for LFO-style cycling
- Switchable exponential and linear curve shapes
- State saved across power cycles
- Reverse polarity protection
- Skiff friendly depth
- Red output level LED
Controls & Jacks (15)
- Shape — Attenuator for Attack CV input control signal.
- Loop
- Loop Mode — Yellow LED indicates when looping mode is enabled.
- Attack Time — Controls attack time from sub 1ms to ~100 seconds. Fully CCW = sub 1ms, fully CW = ~100s. Acts as attenuator when CV patched.
- Gate Input — Gate input for Attack/Sustain/Decay envelope mode. Envelope rises then stays high at ~5v whilst gate is high before falling.
- Envelope Output — 0-5v envelope output. Red LED indicates output level.
- Trigger Input — Trigger input for Attack/Decay envelope mode. Produces envelope that rises to ~5v then instantly falls.
- EOS
- Decay CV Input — 0-5v control voltage input for decay/release time modulation. Patching a cable makes the Decay Time knob act as an attenuator.
- Output — Red LED indicates envelope output level.
- Decay Time — Controls decay/release time from sub 1ms to ~100 seconds. Fully CCW = sub 1ms, fully CW = ~100s. Acts as attenuator when CV patched.
- Attack CV Input — 0-5v control voltage input for attack time modulation. Patching a cable makes the Attack Time knob act as an attenuator.
- Loop Button — Press to enable/disable automatic looping. Long hold (~3 sec) toggles envelope curve between exponential and linear.
- Decay CV Attenuator — Attenuator for Attack CV input control signal.
- Attack CV Attenuator — When a CV cable is patched into Attack CV Input, this knob attenuates the incoming CV signal rather than setting absolute attack time.
How-To Guides
- Percussive Drum Hit Envelope
- Slow Pad Swell
- Self-Looping LFO Modulation
- CV-Controlled Attack Sweep
- Linear Looping Staircase
- Accent Velocity Layering
- Filter Pluck Sound Design
- Sustained Drone Gate Hold
- Rhythmic Tremolo Effect
Explore the interactive Pip Slope panel on BleepDex — tap any control to learn what it does.
