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.
