bleeding from the interpolation artefacts audible in almost every second
composition.

in your specific cases, are the artifacts really caused by the interpolation scheme or rather a product of indexing [tabread4~] with large floats (instead of using the second inlet)?

if it is really the interpolation, would you mind sharing sound examples? I'm genuinely curious.

Agreed (also, maybe some where using lossy data compressed files with low bit-rates as sources etc. ...)

Care to share some audio snippets?

Lorenzo