04.08.2014 18:40, Peter Meerwald wrote: > + quality_spec = soxr_quality_spec(SOXR_QQ, 0); SOXR_QQ means "quick cubic interpolation" - i.e. the worst quality level provided by the library. It is worse than speex-float-1 (but the message with the relevant plots exceeded the maximum tolerable size for the list). I think that it makes sense to expose other quality settings provided in soxr.h. -- Alexander E. Patrakov