xaoc-devices-praga

XAOC Devices Praga

Expandable four-channel voltage controlled stereo mixer

20 HP Eurorack module

Praga is an expandable four-channel voltage controlled stereo mixing console for Eurorack, featuring a stereo mixing bus, two auxiliary sends with stereo returns, and dedicated unipolar and bipolar CV modes for volume control. It offers a super-clean signal path via high-quality VCA and opamp chips, clickless muting, DC-coupling, and a soft-clipping summing bus that imparts gentle analog character when driven hard. Musically it serves as a performance-ready mixer with deep modulation capabilities for dynamic, evolving stereo soundscapes.

Features

  • Four identical channels with Volume, Pan, and Aux Send controls
  • Unipolar CV volume mode optimized for envelope generators (0V to 8V)
  • Bipolar CV volume mode optimized for LFOs (-5V to +5V)
  • CV input for pan per channel, bipolar -5V to +5V
  • Clickless channel muting with few-millisecond fade to -90dB
  • Five-bar post-fader LED level indicator per channel with thresholds at -32dB, -20dB, -12dB, -6dB, 0dB
  • Direct VCA output per channel (pre-pan, post-volume)
  • Two auxiliary sends with two pairs of stereo return inputs
  • Bipolar aux knob sends signal to Aux A (left of center) or Aux B (right of center)
  • Post-fader aux sends derived from VCA Out signals
  • 3dB pan law with gain compression near 0dB to prevent loudness increase
  • Soft clipping mixing bus circuit for gentle overdrive above 16Vpp

Controls & Jacks (42)

  • Channel 4 VCA Out— Direct VCA output of attenuated signal unaffected by pan control, useful for multitracking or insert functionality
  • Channel 3 VCA Out— Direct VCA output of attenuated signal unaffected by pan control, useful for multitracking or insert functionality
  • Channel 2 VCA Out— Direct VCA output of attenuated signal unaffected by pan control, useful for multitracking or insert functionality
  • Channel 2 Input— Audio signal input for Channel 2
  • Channel 3 Input— Audio signal input for Channel 3
  • Aux Return A Left— First auxiliary send output, mono mix of signals routed to Aux A from all channels
  • Channel 1 Volume— Manual control of Channel 1 level, response depends on selected control mode (unipolar or bipolar)
  • Channel 3 Volume CV— CV input for volume control, behavior depends on selected mode (unipolar or bipolar)
  • Channel 4 Input— Audio signal input for Channel 4
  • Channel 3 Pan CV— CV input for pan control, expected range -5V to +5V
  • Aux Send A— Audio signal input for Channel 1
  • Channel 1 VCA Out— Direct VCA output of attenuated signal unaffected by pan control, useful for multitracking or insert functionality
  • Channel 1 Input— Right channel of second stereo auxiliary return input
  • Channel 2 Volume CV— CV input for volume control, behavior depends on selected mode (unipolar or bipolar)
  • Channel 1 Pan CV— CV input for pan control, expected range -5V to +5V
  • Channel 2 Pan CV— CV input for pan control, expected range -5V to +5V
  • Channel 4 Pan— Adjusts Channel 1 position in stereo panorama, acts as offset to CV pan input
  • Channel 1 Volume CV— CV input for volume control, behavior depends on selected mode (unipolar or bipolar)
  • Channel 4 Volume CV— CV input for volume control, behavior depends on selected mode (unipolar or bipolar)
  • Channel 2 Volume— Manual control of Channel 2 level, response depends on selected control mode (unipolar or bipolar)
  • Channel 4 Pan CV— CV input for pan control, expected range -5V to +5V
  • Channel 2 Active/Mode— Illuminated button to mute channel or switch between unipolar (green) and bipolar (red) control modes
  • Aux Return B Right— Second auxiliary send output, mono mix of signals routed to Aux B from all channels
  • Aux Send B— Left channel of second stereo auxiliary return input
  • Channel 4 Aux Send— Bipolar knob controlling amount of signal sent to auxiliary channel A or B
  • Channel 3 Pan— Adjusts Channel 2 position in stereo panorama, acts as offset to CV pan input
  • Stereo Sum Out Right— Left channel of stereo master output summing all channels
  • Aux Return B Left— Left channel of first stereo auxiliary return input
  • Channel 1 Aux Send— Bipolar knob controlling amount of signal sent to auxiliary channel A or B
  • Stereo Sum Out Left— Right channel of stereo master output summing all channels
  • Aux Return A Right— Right channel of first stereo auxiliary return input
  • Channel 3 Aux Send— Bipolar knob controlling amount of signal sent to auxiliary channel A or B
  • Channel 2 Aux Send— Bipolar knob controlling amount of signal sent to auxiliary channel A or B
  • Channel 4 Level Meter
  • Channel 3 Volume— Manual control of Channel 3 level, response depends on selected control mode (unipolar or bipolar)
  • Channel 4 Active/Mode— Illuminated button to mute channel or switch between unipolar (green) and bipolar (red) control modes
  • Channel 1 Level Meter
  • Channel 1 Level Meter LED
  • Channel 4 Level Meter LED
  • Channel 3 Active/Mode— Illuminated button to mute channel or switch between unipolar (green) and bipolar (red) control modes
  • Channel 4 Volume— Manual control of Channel 4 level, response depends on selected control mode (unipolar or bipolar)
  • Channel 1 Active/Mode— Illuminated button to mute channel or switch between unipolar (green) and bipolar (red) control modes

How-To Guides

  • Basic Four-Channel Stereo Mix
  • Envelope-Controlled Amplitude
  • LFO Tremolo Effect
  • Automated CV Panning
  • Stereo Reverb Send
  • Dual Parallel Effects (Reverb + Delay)
  • Chained Sub-Mix with Two Praga Units
  • Multitrack Recording via Direct VCA Outputs
  • Saturated Bus Drive
  • Live Mute Performance

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

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