VoiceTone C1 : Quite good but not perfect

The C1 VoiceTone should be called as a HumanVoiceTone as it works quite well with vocals but unfortunately it fails with any (monophonic) instrument with rich harmonic partials / overtones. I could heard noise like boiling eggs with the highest notes of an alto sax, in the altissimo range the pith correction sounded even worse. With a tenor sax it was a bit better.

I tested the C1 in the lab with pure sine wave and discovered that the pitch correction becomes unstable and noisy with frequencies above 1000Hz and above 2700Hz there is no correction at all.

Very few singers can reach such high notes but as I aimed to use the C1 for saxophone demos it seems that I may have to get more expensive device.

However there is nothing to complain about the overall (dry) sound and the preamp has a lot of gain with low noise.