xaoc-devices-bohumin

XAOC Devices Bohumin

Stereo AUX-B expander for the Ostrawa mixer

10 HP Eurorack module

Bohumin is a dedicated expander for the Xaoc Devices Ostrawa stereo mixer, adding a second full-stereo auxiliary bus (AUX B). Each of Ostrawa's four channels gains an AUX B send level knob and a bipolar CV input, feeding stereo send outputs and return inputs for an external effect. Two attenuators set the return level of the AUX A and AUX B buses, and four gate inputs provide clickless remote muting of each channel.

Features

  • Second full-stereo auxiliary bus (AUX B) for the Ostrawa mixer
  • Four per-channel AUX B send level knobs
  • Four bipolar CV inputs for voltage control of AUX B send per channel
  • Internal VCA on each AUX B send for clean CV modulation
  • Stereo AUX B send outputs and stereo return inputs
  • Manual stereo return attenuators for both the AUX A and AUX B buses
  • Four gate inputs for clickless remote channel muting
  • AUX effects run in parallel with the main mix, added rather than replacing the dry signal
  • Ostrawa channel buttons stay active alongside gate control
  • Powered directly from Ostrawa with no separate bus connection
  • 10 HP wide and 31 mm deep, skiff-friendly
  • Pairs with a single Ostrawa unit

Controls & Jacks (18)

  • AUX Send 1
  • AUX Send 2
  • AUX Send 3
  • AUX Send 4
  • AUX Ret A
  • AUX Ret B
  • Active 2
  • Active 3
  • Active 4
  • Active 1
  • AUX B CV 1
  • AUX B CV 2
  • AUX B CV 3
  • AUX B CV 4
  • AUX B Send L
  • AUX B Send R
  • AUX B Return L
  • AUX B Return R

How-To Guides

  • Stereo reverb on the AUX B bus
  • CV-automated effect throws
  • Clickless rhythmic muting
  • Parallel processing on one channel
  • Tame a hot AUX A return

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

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