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Originally Posted by seancostello  Ragged edge is probably good enough for this application. The SST-282 that Casey brought up used NO interpolation for its modulated feedback taps. It just went ahead and moved them. |
Chris didn't like that but it would be difficult with the SST architecture to do anything much about it without adding many more PROMs to the design. He even commented on it in the brochure. You'd have to make the gain prom pretty big, and run another state machine for tap fadeins before moving the tap.
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Casey's interpolation example used 32 discrete steps between samples. This was probably not meant to be an ideal example, of course. It seems like the 224 might have 64 possible steps for its interpolation if using the two line chorusing, which may produce acceptable results.
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If you updated the chorus gain coefficients and addresses on every sample, that would be the same granularity as a 4 Hz chorus of a 3ms depth, even if you had a more precise multiplier you'd have that granularily anyways. That's a faster chorus than I would expect in a reverb, but a two-line chorus would be at least not in the grunge area of granularity.