Does this work on synthesized sounds (like analog or physical modeling rather than samplers)? How does it handle the complexity of piano timbres (notoriously difficult to synthesize)?
The current architecture imposes some strong assumptions on the source (such as harmonicity) which does not necessarily apply to all instruments (bells for instance). The harmonic + noise model is not that good with transients either (which is a key ingredient in piano sounds) but of course you could solve that through different means.