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Hi EnglishMuffin Sorry I didn't mean to imply you'd said that. I just kinda assumed that I had perfect pitch, and was a bit disappointed to be a tone out. I do wonder if pp is more common than we imagine. Cheers Tony

"Perhaps visual colour is more akin to loudness than tone in sounds?" I agree. If I played "do ray me" to anyone, they'd easily put the tones in frequency order. If I presented them with red, blue, green, most people wouldn't have a clue. But in both cases they could say which was the loudest...

Interesting comparison with the eye. The eye has detectors for three frequencies, but can't tell us anything about the actual frequencies, or their ratios. The ear has detectors for >1000 frequencies, and although it can't tell us the exact frequency, it does report the ratio between any two...

Thanks. That has helped my thinking.... ..................... I have another thought... A very long pipe with a speaker at one end, and pressure sensors along its length. For a given wavelength, pressure sensor should detect a minimum at 1/4 wavelength. -perhaps? ................... The reason...

I know of two ways to identify a frequency: 1. Resonance... eg: Set up an array of tuned resonators, bottles, or piano strings, and see which one resonates to the frequency under investigation. 2. Counter & Timer... Count the peaks per second, mechanically or electronically Are there any other...