Re: time stretching

[improv@peak.org (Dave Trenkel)]

>A non-loop-content question, but not about guitars either. Reply using 
>private
>email if you want.
>
>Has anyone used software to time-stretch samples? I'd like to be able to
>stretch very fast and complex natural sounds (birdsongs, etc), but the
>resulting samples should not lose their sound quality. I've heard good 
>quality
>time-stretched samples - so I know it can be done - but I don't know how.
>I was
>not happy at all with the programs I've tried so far. The resulting 
>samples
>(same pitch, but double duration) sounded like shit. They were all
>modulated as
>if treated with a low-pitch ringmodulator. Speeding the samples up to 1/2
>duration sounded even worse.
>
>Ideas anyone?
>
Arboretum Systems Hyperprism has very good sounding time-stretching, and,
given your intended use, there seems a sympthetic resonance with the
comapny's name. I've not done birdsong, which seems like it would have a
lot of material in the range around the nyquist frequency of whatever
you're digitizing the sound with. I have done some extreme time stretching
on wind instruments, one piece with oboes slowed to 1% of their original
speed, a 10 second phrase took about 4 minutes to plat through, and there
were surprisingly few artifacts from the processing.

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Dave Trenkel : improv@peak.org  : www.peak.org/~improv/

"...there will come a day when you won't have to use
gasoline. You'd simply take a cassette and put it in
your car, let it run. You'd have to have the proper
type of music. Like you take two sticks, put 'em
together, make fire. You take some notes and rub 'em
together - dum, dum, dum, dum - fire, cosmic fire."
                                            -Sun Ra
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