[stella] New Music Effects

[Paul Slocum <paul-stella@xxxxxxxxxxxxxx>]

I figured out a couple of new music tricks.  I got a nice phasing sound by 
changing the AUDFx register on one voice for a few cycles each beat.  This 
shifts the phase a bit and if you play the same thing on both voices, 
you'll get a nice effect.  I also figured out how to do a high-hat-ish 
sound without using either voice by just fiddling with the volume 
registers.  It produces a little click that accents the rhythm.  And I 
think the sound of the click can be improved with a little tweaking.  The 
nice thing is that these effects use up almost no extra resources (CPU, 
memory or ROM.)

I've attached a ROM demo of the effects and I'm not sure how well these 
effects will emulate, so here's an MP3 of the demo recorded from my 2600 
(800k):

http://www.mindspring.com/~paul-slocum/temp/2600_phase_hh.mp3

-Paul

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