[sdiy] Multiplexed Expo Converter?

[cheater cheater]

Hi guys,
This might be relevant to the DIY Polysynths thread going on at the same time.

I heard that Korg used to multiplex the Expo Converters in their
polysynths. I think it's a pretty good idea to keep things in sync, so
that even if the EC floats, every part floats in the same way at the
same time. This is also good because it simplifies the design.

There are several questions to this, though:
1. what could the performance be, at best, in samples per sec?
2. when are EC's used with input signals that are audio-rate? and can
this stuff be re-designed so that it doesn't require an EC at all?
We're talking about a closed-box synth, not something that is fully
modular and requires the signals to be patchable out in some sort of
standard format.

Cheers
D.