Hi!
Whistile.
The whistle is almost sine.
It is good to… convertwhistle to notes.
Inside renoise.
It my dream. 
Thanks to afta8, there’s actually something pretty close:
https://www.renoise.com/tools/slices-to-midi
Dream come true?
I use this technique, hum or whistle the tune with a bit of beatbox to get my idea flowing.
Just hover your mouse over the peak in the spectrometer or spectroscope and it will tell you both frequency and note.
It is not automatic, but it is quick and it is easy to use even to identify notes in anoisy sample with multiple instruments.