I thought that a true two tone generator require two absolutly
independant audio sources to be present.
If you took a software 2 tone generator, or a switched synth then
at any monent in time there's actually one one of the tones present.
To the ear, it would appear as two tones but in reality it's just one
tone present at a moment in time - not what require.
Best off having two totally independant and non harmonically related
tones mixed together, something that I don't think a software generated
system can provide, or a a TINY SA.
Two crude AF osc's made from a pair of BC108's / 2N2222's would be better.
73 de Andy
