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The Echoplex and the old sampler pitch change by really changing the sample rate on the D/A convertors. The newer sampler probably does it digitally by interpolation techniques or other DSP pitch-shift techniques, and maintains the same sample rate on the convertor. I don't think oversampling or the anti-alias filtering would have anything to do with the effect you are hearing. Oversampling isn't "smoothing out" the waveform. It is a mathematical technique that spreads out the aliased frequency bands so they aren't right next to each other. That makes it simpler to filter out the aliased bands with a less-complex low-pass filter with a gentler slope. kim At 02:39 AM 6/24/2004, Jesse Ray Lucas wrote: >I was just curious since comparing the sound of an older Akai S2000 >sampler >against the sound of a newer S5000 sampler. Although both are 16-bit >samplers, the older model sounds "grittier" when you pitch samples down or >resample to a lower bandwidth. The EDP sounds gritty, too, when you shift >into halfspeed. > >As I understood that article it was saying that during the D-A conversion >the oversampling process was the interpolation of in-between samples into >the signal to smooth the waveform out. > >Just trying to figure out what makes that sound sound the way it does. If >you say it's the anti-aliasing filters that matter, then I believe you. >Thanks for the info. > >-J > ______________________________________________________________________ Kim Flint | Looper's Delight kflint@loopers-delight.com | http://www.loopers-delight.com