Hi there,
I have just noticed a tuning problem on my Voyager EB. WIth only OSC1 on, square wave, no modulation and all ENV/FILT effectively bypassed, using the built-in keyboard (not MIDI or external CV control), I’m definitely having keyboard tracking issues. With A4=440.00 (Fine Tune knob is at about 11 o’clock), I get the following:
A1=54.01 (-0.99 Hz)
A2=108.70 (-1.30)
A3=218.66 (-1.34)
A5=885.55 (+5.55)
A6=1783.5 (+23.5)
A7=3593 (+73)
Above A4, this is far off enough from accurate for me as to cause some real pain aurally and no longer sound musical. For what it’s worth, I get the almost the exact same error on both OSC2 and OSC3 with the same settings, so this is definitely a keyboard tracking issue, not one OSC being out. (OSC3 is a couple of Hz higher at the top end, even with the Frequency knob set to 0; it’d be nice to fix that but it’s not a priority.)
Can anyone provide the keyboard tracking adjustment or tuning procedure? I know it was provided with my analog upgrade board, but damned if I can’t find the sheet of paper that came with it now.