Filter: The Resonance potentiometer allows for setting the filter resonance manually. If a CV is plugged to the resonance CV input, this control turns into it's attenuator.
There's also a scalable CV input for modulating the cutoff frequency.
VCO: An exponential FM input with attenuator. It is an addition to the VCO's lineaar and Thru-Zero inputs.
VCA: full fledged VCA including an input with level control, an output and a CV input with attenuator.
The expander connects to the Bateleur via a ribbon cable. No soldering required.
filter: CV inputs for resonance and cutoff
VCO: FM input
VCA: input, output, CV input
3U Eurorack expander module, 8 HP wide