OK, a correction here:
1. right offset poti
2. left offset poti
3. right side bias poti
4. left side bias poti
5. yes, negative
6. & 7. GROUND !!!! needed to bias the offset...either with negative or positive speaker outputs 5 & 8....NEVER NEVER EVER use the positive and negative outputs 5 & 8 together to bias the offset !!!!!!!!!!!!!!!!!!!
8. yes, positive