[sdiy] components, smd and pcb

[jhaible]

>    Now I've got a question for you...why not use the last stage of the
> CD4520 and have 5 octave out instead of 4?   Sure it adds a few more
> parts, but it'd make it compatible with modern keyboards.  That's one of
> the gripes I have when trying to control my MIDI'd PS-3100.

I will do this, but only for *one* VCO per board. I'm not aiming at 61
notes,
but 49 notes (most 4-octave keyboards) would be nice. On the pcb, there
is just space for one more output stage, not for 6 of them anyway.

I might spread the VCF / VCA / ADSR circuits on 10 * 5 cards rather than
12 * 4 cards then.

JH.