[sdiy] microcontroller MIDI sequencer

[Blitzcraig]

My new project is to create an 8 channel MIDI sequencer using a Motorolla
HC12 microcontroller.

The design is very basic...
pushbutton toggle (start/stop sequence)
tempo pot with numberic display

8 channels consisting of...
pushbutton toggle with LEDs (on/off)
gate time pot
velocity pot
note value pot

I have most of the code written, the HC12 has an onboard A/D (32 channels
total).  I would like to have an octave pot for each channel, but this
would put me over the number of A/D channels available.  suggestions?

I'm looking for a notched potentiometer for the note values (12 notches),
suggestions?

I can't find a resource for standard MIDI pin I/O (such as which pin is
note number, velocity, etc.), suggestions?

Any other suggestions would help.

-Joe Craig
www.blitzcraig.com