Variable Sample rate clock as a varispeed control in DAW?

Archived from groups: rec.audio.pro (More info?)

In article <1116012144.018224.135800@g14g2000cwa.googlegroups.com> donnybastard@hotmail.com writes:

> Is this as simple as it seems? Can you just manually vary the sample
> rate of a master clock and get, in effect, a varispeed control for a
> multitrack DAW? Certainly playing back a 96k recording at 88.2k slows
> and lowers the pitch (approx. a whole-step) so it should be that
> simple. Are there issues of additional jitter or other sorts of
> distortion of the clock signal?

In theory it's that simple. In practice there are a few things that
tend to get in the way and are dependent on individual designs. (that
means "you'll have to try it" ) You might have problems with jitter,
though modern digital hardware generally does a pretty good job of
cleaning up a crummy clock source. Also, most digital systems have a
finite "lock range" that requires that the clock be fairly close to
the nominal sample rate. You might be able to move it 10% or so, but
not much more.

> Finally, does anyone make a clock with
> manually variable sample rate?

Not that I know of, but I've used an old Wavetek function generator
(available from used test equipment dealers) with my Mackie HDR24/96
without disasterous results.




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