I'm not sure, but it seems like you are likely to get trouble with
phase cancellation with any kind of mixing. It seems unlikely to me
that it would be possible to perfectly align the phases of all
partials in two (piano) samples. But I might be wrong.

Just an idea,
maybe you could split the audio into separate frequency bands, mixing
each band separately. This would mean (simplified)  that you took e.g.
the high frequencies of sample 2 mixed with the lows from sample 1,
and used this as the "interpolation midpoint"
Hi: 1   2  2
Lo: 1  1  2
Obviously, this would not get rid of the phase cancellations of
frequencies very close to each other. And on second thought, those are
the ones you would be most keen on getting rid of...

Oeyvind

2008/8/29, Michael Mossey <mpm@alumni.caltech.edu>:
> I didn't get an answer, so thought I'd try again. I'm interested in
> implementing my own layered sampler with the capability to interpolate
> dynamic levels between layers. I want to know if this is a simple matter of
> mixing signals from adjacent layers at amplitudes R and 1-R.
>
> I think the critical question here is whether the samples are " phase
> coherent"? Is that true?
>
> For mixing between non-phase coherent signals, I think you would use an
> equal power formulation: sin R and cos R. Is that right?
>
> It's piano samples I want to use. I believe they are already phase coherent
> as designed.
>
> Thanks,
> Mike
>
>
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