Yamaha CS80

Hi there!

Thankfully I seem to have sorted out the CS60 wrong notes being played
problem (probably some dirt between some legs of some chip on the KAS
board, I dusted it off well and it's working fine now, fingers crossed
it stays that way!).

So onto the second problem, the CS60 appears to be stuck in Sustain II
mode, even when I switch it to Sustain I mode (only the last note
sustains all the time). From the circuit diagram the Sustain II switch
is connected to the SH board, are there any points here I could be
measuring to narrow down what's at fault? (I presume only two wires
should be soldered onto the Sustain I/II switch, which is currently
the case here)

Also (this may be related), when I have sustain off and the attack
right down to 0, all the notes sound straight away when I play them as
they should. However when I turn sustain up (either on the VCO or on
the panel on the left) and play chords, the attack is delayed for some
of the voices, is this something that could be fixed by
re-tuning/calibrating the voices? (the actual tuning is fine though)

Thanks in advance and let me know if I need to explain myself better here!

-Stephen
-- 
http://www.skkatter.net