[A6] Internal electronics, Found it!

[Jeff Platt]

> > Thats probably the main reason, the CPU has to latch the DAC value, then
> > wait for the mux cap to settle the charge, and in between CPU takes the
next
> > DAC and so on.
>
>   Does the CPU do this on its own or is there hardware assist?  Jeff!  :)

Both. :)

> > > (So, in an update cycle, you are simultaneously charging the s&h
> > > for pitch CV on VCO 1a, 5a, 9a, 13a - then pitch CV for VCO 1b, 5b,
9b,

Yes.
This can't all be done by the same DAC because of the setup time required
by the sample and holds in the ASICs.

> > Possibly so , but still, most times in a multitimbral setup for example
the
> > chance
> > of CV's  being completely different due to different pitches, filter
cofficients
> > etc etc are very high.!

Right. That's why tables are used.

>   I think by "simultaneously" he meant that you run through the "TDM"
cycle
> of the muxed CVs at (roughly) the same, not that they all get the same
CVs.

Right.

> > VCO's a tune table is a neat solution to a design problem, its also a
short cut
> > to easyied up silicon design requirements and design time who equals to
cost in
> > a very unpleasant way!! :-:
> >
>
>   Hey--it's cheap and it works!  What more could you ask for?  :)

Exactly.
Sorry to be short, I don't know how much I should talk about, even though I
didn't sign an NDA at Alesis ;-)

Jeff