Eddy

Schlappi Engineering 8HP
MIXER VCA DISTORTION FILTER COMPRESSOR

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Three-channel stereo submixer with CV control, sidechain compression, distortion, and normalized feedback filters. It covers clean mixing, feedback percussion, and aggressive bus processing in 8HP.

Patch Ideas · 5

★ Clean stereo submix
Three stereo sources into channels 1-3 · OUT select on MIX · level pots around noon · use CV inputs for final automation on a compact stereo bus.
▸ Show diagram
Patch diagramPatch diagram with 5 modules and 8 connections. Modules: Eddy, VCO A, VCO B, Pad, Output. Signals: 8 audio.EddyVCO AVCO BPadOutputOUT select: MIXSidechain: IN4Channel 1 switch: onChannel 2 switch: onChannel 3 switch: onIN 1 LaudioIN 1 RaudioIN 2 LaudioIN 2 RaudioIN 3 LaudioIN 3 RaudioOUT LaudioOUT RaudioOut LaudioOut RaudioOut LaudioOut RaudioOut LaudioOut RaudioLaudioRaudioaudio
★ Sidechain pump
Pads on channels 1-3 · kick into IN 4 as the sidechain source · OUT select on COMP · the mix ducks around the kick without extra patching.
▸ Show diagram
Patch diagramPatch diagram with 4 modules and 9 connections. Modules: Eddy, Kick, Pad, Output. Signals: 9 audio.EddyKickPadOutputOUT select: COMPSidechain: SCHAINChannel 1 switch: onChannel 2 switch: onChannel 3 switch: onIN 1 LaudioIN 1 RaudioIN 2 LaudioIN 2 RaudioIN 3 LaudioIN 3 RaudioIN 4 / SidechainaudioOUT LaudioOUT RaudioOutaudioOut LaudioOut RaudioLaudioRaudioaudio
★ Distorted bus
OUT select on DIST · drive the input levels harder · use the invert switches to hollow the center or reinforce the sides before the bus clips.
▸ Show diagram
Patch diagramPatch diagram with 4 modules and 6 connections. Modules: Eddy, VCO A, VCO B, Output. Signals: 6 audio.EddyVCO AVCO BOutputOUT select: DISTChannel 1 switch: onChannel 2 switch: invertChannel 3 switch: onIN 1 LaudioIN 1 RaudioIN 2 LaudioIN 2 RaudioOUT LaudioOUT RaudioOut LaudioOut RaudioOut LaudioOut RaudioLaudioRaudioaudio
No-input feedback texture
Leave the main stereo inputs empty · raise the channel switches to engage the normalized feedback network · inject one mono source on IN 4 if you want the texture to lock to a pulse.
▸ Show diagram
Patch diagramPatch diagram with 4 modules and 4 connections. Modules: Eddy, Clock, Noise, Output. Signals: 3 audio, 1 trigger.EddyClockNoiseOutputOUT select: MIXSidechain: IN4Channel 1 switch: onChannel 2 switch: onChannel 3 switch: onIN 4 / SidechainaudioOUT LaudioOUT RaudioOuttrigTrigtrigOutaudioLaudioRaudioaudiotrigger
Triple stereo VCA style sweep
Use the three stereo channels as a small voltage-controlled gain stage · animate all three CV inputs with envelopes for a wide moving mix before the output bus.
▸ Show diagram
Patch diagramPatch diagram with 6 modules and 7 connections. Modules: Eddy, Envelope A, Envelope B, Envelope C, VCO, Output. Signals: 4 audio, 3 cv.EddyEnvelope AEnvelope BEnvelope CVCOOutputOUT select: MIXChannel 1 switch: onChannel 2 switch: onChannel 3 switch: onCV In 1cvCV In 2cvCV In 3cvIN 1 LaudioIN 1 RaudioOUT LaudioOUT RaudioOutcvOutcvOutcvOut LaudioOut RaudioLaudioRaudioaudiocv

Behaviors

Stereo submix patch audio into the three stereo channels

The module behaves as a compact stereo submixer with per-channel gain and CV control.

On / invert / off channel mode move a channel switch

Each stereo channel can be passed normally, inverted, or muted, which makes the mixer useful for cancellation and widening tricks.

Sidechain compression select SCHAIN and feed IN 4

The fourth input can act as a sidechain source, so kick-driven ducking is available without a dedicated compressor.

Output bus selection move OUT select

DIST, COMP, and MIX buses are all available on the same main outputs, so the final flavor can change without re-patching.

Feedback normalization leave channels unpatched and raise the switches

Unpatched channels can feed back internally, which makes no-input mixing and self-generating textures possible.

Feedback percussion use the normalized feedback paths

The internal bandpass feedback network is tuned for tone-shaping and percussion rather than textbook equalization.

Controls

Channel 1 Channel 1 level Sets the gain for the first stereo channel.
unity near noon
Channel 2 Channel 2 level Sets the gain for the second stereo channel.
unity near noon
Channel 3 Channel 3 level Sets the gain for the third stereo channel.
unity near noon
Channel 4 Channel 4 / Sidechain level Sets the gain for the mono fourth input or sidechain path.
mono input or sidechain
Channel 1 Channel 1 mode switch Turns the channel on, inverts it, or mutes it.
up: on · center: invert · down: off
Channel 2 Channel 2 mode switch Turns the channel on, inverts it, or mutes it.
up: on · center: invert · down: off
Channel 3 Channel 3 mode switch Turns the channel on, inverts it, or mutes it.
up: on · center: invert · down: off
Global OUT select switch Selects which mix bus appears at the main outputs.
DIST · COMP · MIX
Global Sidechain switch Chooses whether the fourth input is mono audio or sidechain control.
IN4 · SCHAIN

I/O

IN · 11

  • CV In 1 0-10V CV
    Control voltage for channel 1 gain.
  • CV In 2 0-10V CV
    Control voltage for channel 2 gain.
  • CV In 3 0-10V CV
    Control voltage for channel 3 gain.
  • CV In 4 0-10V CV
    Control voltage for the fourth mono or sidechain channel.
  • IN 1 L audio AUDIO
    Left input of stereo channel 1.
  • IN 1 R audio AUDIO
    Right input of stereo channel 1.
  • IN 2 L audio AUDIO
    Left input of stereo channel 2.
  • IN 2 R audio AUDIO
    Right input of stereo channel 2.
  • IN 3 L audio AUDIO
    Left input of stereo channel 3.
  • IN 3 R audio AUDIO
    Right input of stereo channel 3.
  • IN 4 / Sidechain audio AUDIO
    Mono fourth input or compressor sidechain input.

OUT · 2

  • OUT L audio AUDIO
    Main left output, carrying the selected bus.
  • OUT R audio AUDIO
    Main right output, carrying the selected bus.