More improvements to MIDISID and Music Box 2 rendered on dual SID

This is my 'Music Box 2' tune again, this time with MIDISID doing its thing and receiving 6 channels of MIDI, rendering them using the 6 voices of 2 SIDs. 

Recent improvements are that we now have pulse width modulation to improve some of the sound patches. The SID allows you to set the pulse width of a square wave, which changes the sound. But the real magic happens when you move that pulse width programmatically while the note is sounding. It's a part of the SID's very distinctive sound.

And we've moved to a new version of the pcb. The pcb is still very early stages but here we get more components off the breadboard, notably the transistor output stage.

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