XAOC Devices Ostrawa
Stereo four-channel voltage-controlled mixer with aux send and metering
20 HP Eurorack module
Ostrawa is a fully stereo four-channel voltage-controlled mixer built around high-quality VCAs and a DC-coupled signal path. Each channel offers CV-controllable volume and pan, a switchable pre/post-VCA stereo aux send, clickless muting, and a five-LED level meter. A soft-clipping stereo mixing bus, stereo aux returns, direct stacking inputs, and unit chaining make it a compact but expandable mixing console.
Features
- Full stereo four-channel voltage-controlled mixer
- DC-coupled, super-clean signal path with high-quality VCA and opamp chips
- Natural studio-fader volume curve from a bent-exponential VCA response
- Per-channel volume CV with internal 8 V normalling for full-range knob operation
- Per-channel bipolar balance (pan) CV following a 3 dB pan law
- Stereo inputs with mono normalling that centers a single-jack source
- One stereo aux (A) send per channel, switchable pre-VCA or post-VCA
- Stereo aux returns added in parallel to the main mix
- Illuminated Active buttons with clickless muting (fade to near -90 dB)
- Five-LED post-fader level meter per channel (-40 to 0 dB)
- Soft-clipping mixing bus for gentle overdrive above 16 Vpp
- Direct (stacking) inputs to cascade external sub-mixes into the bus
Controls & Jacks (44)
- Ch 1 Volume
- Ch 2 Volume
- Ch 3 Volume
- Ch 4 Volume
- Ch 1 Active
- Ch 2 Active
- Ch 3 Active
- Ch 4 Active
- Ch 1 Balance
- Ch 2 Balance
- Ch 3 Balance
- Ch 4 Balance
- Ch 1 AUX Send
- Ch 2 AUX Send
- Ch 3 AUX Send
- Ch 4 AUX Send
- Ch 1 Level Meter
- Ch 2 Level Meter
- Ch 3 Level Meter
- Ch 4 Level Meter
- Ch 1 Input L
- Ch 1 Input R
- Ch 2 Input L
- Ch 2 Input R
- Ch 3 Input L
- Ch 3 Input R
- Ch 4 Input L
- Ch 4 Input R
- Ch 1 Balance CV
- Ch 1 Volume CV
- Ch 2 Balance CV
- Ch 2 Volume CV
- Ch 3 Balance CV
- Ch 3 Volume CV
- Ch 4 Balance CV
- Ch 4 Volume CV
- Direct Input L
- Direct Input R
- AUX Send L
- AUX Send R
- AUX Return L
- AUX Return R
- Sum Output L
- Sum Output R
How-To Guides
- Mix four stereo sources
- Bring in a mono source
- Parallel stereo effect via aux
- Fully wet send with pre-VCA
- Automate a channel with CV
- Auto-pan a source
Explore the interactive Ostrawa panel on BleepDex — tap any control to learn what it does.
