Vintage Synth Repair

So pitch calibration went great. However.....

When setting the volume of osc2, the data wheel will increase the 
volume until the numeric display reaches 58, then the volume starts 
dropping again as the display approaches 99.

But even at it's volume peak of 58,  osc 2 never reaches the volume 
of osc1 at 99. So I'm assuming the the osc 2 volume is reaching 
approximately half volume, then instead of continuing up to full at 
99, it just decreases back down to a quieter volume again. (In other 
words, 58 is not the equivalent of a normal full volume.)

Very odd.


Jim