[stella] TFXM V1.0

[Manuel Polik <cybergoth@xxxxxxxx>]

Hi there!

> Have you thought of *programming* the music? Sort of 
> like the background noice in Star Ship? Then you could 
> get away with very few bytes. Would be no good 
> *music*, but might simulate the noise of building a 
> skyscraper ;-)

I couldn't resist trying that, result is attached.

This is also a first rudimentary implementation of a 
generic SFX driver called TFXM (The FX Machine), so far 
only existing in my head ;-)

The first implemented feature is that the code 
automatically detects the *least-busy-channel*
The rest is pretty much random driven at the moment, but 
I'll improve it as I need more features.

I programmed all SFX for Gunfight and Star Fire manually 
and it really sucked both times, so it was long time 
overdue that i started something like this ;-)

Greetings,
	Manuel

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