SynthModules

I have two versions of code running.  One is a polled I/O mode which
supports both MIDI input and output.  This works just fine.  I have
it running in a simple loop-through mode removing the MIDI active
sensing bytes from the stream.

I also have a version that runs with interrupt driven MIDI input into
a buffer and polled MIDI output.  I also have it running in a simple
loop-through mode and it works well but occasionally I get one bad
note. I haven't been able to track it down as I cannot use debug mode
at all with interrupts enabled.  I'll have to figure out a way to
determine what is being sent to the synthesizer and see if I can
track it backwards.

This took a lot more time than it should of.  So many items are not
documented well.  Thanks to all, especially Grant, who offered
suggestions and insight.

I still seem to have issues with variables that are bytes. 
Manipulating these bytes seem to clobber the bytes next to them.  It
all works fine if I make them all words.  Anyone else seen this?

I'll keep playing with this but will post the code if someone else
wants to start messing with it.

Dave