sample clock playback tricks

[MIvanBerk@aol.com]

In a message dated 98-02-05 14:53:28 EST, Kim wrote:

<< interesting problem, new technology comes along, making huge 
improvements
 in some ways and obsoleting the old stuff. But there's usually some
 characteristic of the old stuff that becomes very difficult in the new
 technology. And then you need a few more generations of new technology
 before you are able to do the old idea again. In this case, you used to be
 able to easily change the sample clock on A/D and D/A convertors, and they
 would be happy and nothing else in a simple delay system would get screwed
 up. Nowadays, the convertors give better audio but don't let you do that
 sample clock trick anymore, and other things in the system that need
 accurate timing (like midi) get screwed up. So for the echoplex and 
jamman,
 this sort of thing is impossible. So now you need to add a fair amount of
 dsp processing and more sophisticated real-time os techniques to be able 
to
 do what once just required a very cheap part. such is progress....
 
 kim >>

Any idea how the Boomerang folks got around this problem, at least insofar 
as
their unit offers half speed/half sample rate playback?  Boomerang folks?