When I tried to hear two summed waves which have same amplitude, same frequency and different phases, I found a little strange action.
aphase phasor 440, .45
asig tablei aphase, 1, 1
acheck oscili 1, 440, 1
out (asig + acheck) * 3000
f 1 0 8192 10 1
i 1 0 8888
I thought it sounds a certain volume 440hz A.
But actually its volume got smaller, and then silence, and got bigger.
It seemed two signals have a very small deference of freqency.
If anyone know about this action, I would like to get any hint.