Add, subtract, multiply, divide, logic operations ...

[Mark Pulver]

>There is this word that confuses things: mixer

I've lost track of the players here, but I think what the original poster
was looking for is best thought of in the digital domain.

eg... You have two sines, one at say 400hz and another at 800hz. He doesn't
wanna hear the two waves "mixed" together (thus you hearing two tones an
octave apart), but what he wants is to hear the result of the voltage
values of the waves being added together at various points in the time domain.

Hence the potential clarity by looking at the question from a digital point
of view.

I'll run whole numbers for ease...

Take the first wave, and center it on 0v so that you have a + and a - swing
(ie, no bias). Set a sample frequency, say one value for as fast as I can
type it, and then you may end up with sample points like this:

	-3 -3 -2 -2 -1 -1  0  0 +1 +1 +2 +2 +3 +3

Now, the second wave may end up looking like this over the same amount of
time:

	-3 -2 -1  0 +1 +2 +3 +2 +1  0 -1 -2 -3 -2

And, if you *add* these points together you'd get:

	 0 -1 -1 -2  0 +1 +3 +2 +2 +1 +1 0 0 +1

Which is not the same as hearing two tones an octave apart. I think this is
what he's looking for...

Mark
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 Mark Pulver - http://shoga.wwa.com/~mpulver    The "Son of The MIDI Wall"
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