> >    
> The intention of the original example was to play the two tones on 
> separate speakers (left and right).  Might not work on
>    all sound systems/configurations.
> 

Thanks for clarifying this, apparently my speakers weren't balanced (had left 
only) hence the different sounds when swapping sources.  I had also incorrectly 
assumed that dial_tone.py was set up the same as the GRC example which uses an 
adder.  Once I fixed my speakers though everything worked out, I probably spent 
over two hours just adding different saw-tooth, square and triangle waves 
together and messing with the frequency sliders.

Cheers,
-Tim
                                          
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