I am accordion repairer and also an engineer. I plan to make a useful tool in Python to help with tuning. In an accordion, there are several reeds making different sounds at different frequencies, and those create the specific tremolo of accordion. For tuning them, I need to disable one of the reeds, but this doesn't really work, because where the 3 reeds work together, there is a coupling effect, so I need a tool to estimate precisely the fundamental frequency of those sounds with are the same note slightly out of tune.
I wonder if you have any idea as to how to data extract the beat frequency from a recorded sound from three audio sources for example (338 ,440 and 442 Hz).
I was wondering if it is possible in the time domain, with ondelet transforms. This must be implemented in Python.