This is a early rev1 that uses vactrols. It's been many years since I first purchased the PCBs but finally it's working with the help of Dave Brown and his wonderful site ModularSynthesis.
Information on this module is rather scarce.
These days music is generally played in a stereo format but the 227r is all about Quad Sound.
It's quite a wonderful module. The 4 inputs can be assigned to 4 speakers (2 front, 2 rear at the four corners of your room). This is all voltage controllable.
All the sounds are patched out via the card.
I'm concerned the weight of too many cables could cause damage.
Another option is a make a preconfigured patch card: