1966 XAOC Devices Ostrawa Full Stereo Voltage Controlled Mixing Console

1966 XAOC Devices Ostrawa Full Stereo Voltage Controlled Mixing Console

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Ostrawa is a comprehensive four-channel voltage-controlled mixer that operates in full stereo. It boasts a range of features, including a stereo mixing bus, a stereo auxiliary send for each channel (which can be switched between pre and post VCA), stereo returns, clickless muting, individual level meters, and a signal path known for its pristine cleanliness and DC-coupling. The module has been meticulously crafted using high-quality VCA and opamp chips to ensure exceptional performance.

Ostrawa is a sibling module to Xaoc Devices Praga, sharing similar response characteristics and control layout. However, due to its stereo inputs and limited panel space, Ostrawa does have some functional differences. It offers the flexibility to chain multiple Ostrawa and Praga units together, allowing users to create a customised and configurable mixing system. Additionally, there is an optional expander module called Bohumin that can be used in conjunction with Ostrawa.


  • Full stereo architecture
  • Natural volume control behaviour
  • Channel level indicators
  • Stereo auxiliary send and stereo returns
  • Click-less channel muting
  • Expandable by chaining with Praga, more Ostrawa units and optional Bohumin expander module

Technical Details:

  • Eurorack synth compatible
  • 20hp, skiff friendly
  • Current draw: +180mA/-150mA
  • Reverse power protection"

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