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!
- Mazurka!
- Country Sunshine
- Down Home
- Country Waltz
- New Orleans Blues