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Looper's Delight
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>Charles Zwicky wrote: > >>> >>>As I understand it, it's intended to be a way of having a delay >>>with feedback, but arranged so that there's no comb effect on >>>sustained notes. >> >> >>No, not at all.. it's effect is diffuse an impulse. Try putting >>one in the feedback loop of a delay line with a coefficient of >>about 0.5 and you'll hear what I mean... > >The idea is to diffuse *without* comb filtering. There is plenty of comb filtering in an allpass and it's quite audible at a coefficient higher than 0-.3 or so.. >Don't know why you're saying "not at all", >I'm just repeating reverb 101 there. But you're repeating things without a basic understanding of the principals involved, so it has become a semantic argument, and one that it would be pointless to continue unless you showed some interest in the basic engineering . If you are interested in reverb design, I can certainly help. I've done enough of it... :) > >>> >>> >>>>I'm not sure that you meant to write "phase dispersion"... >>> >>>Just meant that different frequencies are delayed by different amounts. >>>(Allpass is also used in a phase fx.) >> >> >>It's an entirely different implementation than what you'd typically >>find in an analog "phase shifter". > >:-) I think I can guess that analog is a different implementation >to digital. But not the difference I was referring to. For starters, it would be impossible to get the amount of delay required from a standard capacitor based allpass filter. > >soniq reverb. >> It's likely that the EH "Freeze" uses a series of allpass filters >>before and after a fixed delay line. > >Two sets of allpass? They're all linear processes so order is not >important. Or is there some other element involved? > >Actually, listening to the demos more it doesn't sound so good on >complex chords, and it's rather more metallic on some notes than others. >Wouldn't be at all surprised if there's some techniques taken from >the EH pedals that *do* use granular techniques, used in order to >get the sound seamless. Doesn't the Hog have a freeze mode which >sounds similar? Why does everything people don't understand get thrown in the "granular" bin? Allpass filters have plenty of resonances and comb filtering effects, just play around with some basic building blocks in some DSP programming environment and you'll start to get a feel for how these things sound. Plus it's a lot of fun...! > >Anyway, I prefer the sound from the Vortex ;-) > >andy -- ... http://www.zmix.net http://www.esession.com/ChuckZwicky http://albumcredits.com/zmix