Apart from the test discs, the discs that were produced under Opsonar are the hardest to get ahold of. These are: Guitar Boogie Champagne Music Gospel Rock Swing It! Vox Humana Cathedral Organ Polka!
Most of the arrangements weren’t “written” per se, but were improvised by the session guys based on certain guidelines laid down by Johnny, Mike and Marshall. The earliest sessions were very haphazard
Over the years, a wide variety of session musicians played for Optigan. The earliest sessions were produced in Cologne, Germany, and constitute the bulk of material that was actually released as discs