[stella] PAL Sound Conversion

[Paul Slocum <paul-stella@xxxxxxxxxxxxxx>]

I'm trying to make a PAL version of the Synthcart.  The colors are not a 
problem.  The main problem is the pitch and tempo.

The tempo is calculated by counting TV frames.  For example, one setting is 
that a beat occurs every 3 frames.  My understanding is that even if I 
leave it at 262 lines, the tempo will be different because the clock runs 
at a slightly different speed.  By my calculation, a TV frame of 262 lines 
will take 16841 microseconds on a PAL system (vs 16686 on NTSC.)  If this 
is correct, I should be able to calculate the tempos fairly accurately.

And I'm stumped on the pitch.  Is there a PAL sound chart somewhere?  I 
don't plan on changing the note tables, but I'd like to accurately document 
the key/tuning of the note tables I use.

-Paul

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