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At 03:08 PM 2/5/98 EST, MIvanBerk@aol.com wrote: >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? I don't know how Boomerang does it, but half speed is usually quite easy with the current crop of A/D convertors. You usually have a few fixed sample rates available that can be selected by the processor, these tend to match sample rates used in various common devices: CD's, DAT, sound cards, etc. So you just switch it on the fly. Variable sample rates, on the other hand, are not so easy. Boomerang also doesn't have to deal with sync, so the question of "what the hell do we do with the midi clock when the user is goin' mad on the delay time knob?" is not an issue for them. kim ________________________________________________________ Kim Flint 408-752-9284 Mpact System Engineering kflint@chromatic.com Chromatic Research http://www.chromatic.com