If I play an electro keyboard (in mono, with a small attack fade in) through the AutomaticVocalPitchCorrection - it largely works well - sound good, with v low latency. In theory this should be relatively easy to pitch detect.

But sometimes the pitch detection is a bit off. E.g. play B (in Cmajor) and it's sometimes B, and sometimes C. Similarly F is often recognised as E. I noted that they are the tones that are only a semitone away. This occurs apparently even with a decent amount of preceding silence which indicates its stateful in some way.

This is when I use the "hack" from #48 - to fix the samplerate - which could be related in someway.