I think the playback patch should be at whatever rate the dac is running at, and in this case filtering won't fix teh problem.
The patch itself runs at dac speed, in it there is a oversampling subpatch. Do you suggest that this is oversampling not necessary?
Most likely the upsampling from 44k1 to 96k wan't done perfectly. I use Julius Smith's "resample" program which I think is quite trustworthy.
I did it with sox, and it should be fine as well.
Will check other parts of my patch for problems.
Thanks Miller and Martin, P