Ok...you know how half of the time I don't know what I'm talking about? Well, I guess this is one of those times.
I think what I meant to say before is that we can hear overtones
, not quarter or half tones. I'm still not quite sure if I'm explaining this right, but you know when you strike a key, you can hear not only the octave above it, but also the harmonic notes too. Like if you hit a low C, you can hear E, G, and the octave up C too - they ring out longer than the other notes. And supposedly, we hear all these overtones without realizing it. It's a characteristic that makes an acoustic grand superior to digital pianos. I don't even know if digital pianos generate overtones....I'm guessing they don't, which is why they always sound too 'clear' to me. (does that make sense?)
I do know that I cannot listen to organ music for very long because the 'overtones' (or half-tones, quarter-tones...whatever) make me nervous and sort of agitated to the point that I start to squirm a little.