OTAVCAs is a dual VCA with variable input level, attenuverters on each CV input, and initial gain control. OTAVCAs have lovely overdrive characteristics, so don't forget to drive 'em hot!
The arrows on the panel between output jacks indicate VCAs' normalled mixing scheme. When a patch cable is not inserted into the left output jack, its output is mixed into the channel's output. The "NEXT" and "PREV" JST connectors on the back of the module allow multiple OTAVCAs to be chained together to create a flexible, warm and toasty mixer with any number of channels.