There was a slight error on the panel wireup diagram X110 and X49 were reversed. The current documentation has been corrected. But here is an illustration to clarify what changed. Very sorry for this but please cut me a little slack since there are hundreds of components in the ULTIMATE and scores of documents (schems and illustrations). The symptom that was reported to me was that Oscillator 3 was louder than the others (well gain of 10 instead of gain of .5 will do that). Also at this gain oscillator 3 would cause clipping in the mixer. Wiring X110 and X49 correctly will fix all of that. R134 is the external input level control and that input needs the additional gain. R269 is the oscillator 3 level control and oscillator 3 (along with osc 1, osc 2, and noise) are fed into the mixer via 200K resistors so that they have plenty of headroom and do not cause the mixer to clip.