Bohumin

The expander for the Ostrawa stereo mixer, in 10 HP, connected to it by ribbon cables: a second full-stereo aux bus, AUX B, post-VCA, its send from each of Ostrawa's four channels set by a knob and a CV through VCAs of its own, and the return attenuators of both aux buses. Four gate inputs mute and unmute Ostrawa's channels without a click.

Key features

• AUX SEND 1 to 4: each channel's AUX B send, with its AUX B CV input (bipolar, ±8 V)
• AUX SEND B L/R outputs and AUX RETURN B L/R inputs
• AUX RET A and AUX RET B: stereo attenuators for the aux returns (AUX RETURN A is on Ostrawa)
• ACTIVE 1 to 4: gate inputs muting each channel (about 2.4 V or more opens it)
• Draws its power from Ostrawa (+50 mA / -40 mA)