Joe Offer

precisely why I took the approach I did. Present the data in a different form that can be understood off-line as it were. Singing or records are momentary. Slowing things down doesn't always work and you have to know the note. I chose to display the spectrum so that harmonics become apparent and they are the confirmation of any guess. Shame I have not finished it, watch this space. I did finish one version but it is DOS and was limited to one obscure sampling frequency.