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USB-MIDI controller capable?

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re8:
How capable is the Digistump for connecting multiple buttons, potentiometers , LEDs, etc while relaying the scanned values back to the computer via USB-MIDI please?  I assume I'll need at least 1 I2C Port Expander; how many can I place on a single Digistump?  I don't think I'll need MIDI connectors, but info on that may be helpful for down the line.

Most of my research for USB-MIDI points at the Arduinos, but they can get expensive if adding extra shields or I want to mass-produce.  For my purposes, the 2 Teensies compete with the Digistump; smaller & cheaper than Arduinos, still compatible, but much more memory, CPU, & I/O than the Digistump.  (with I2C, I'm more concerned with the memory/CPU right now...).  http://www.pjrc.com/teensy/index.html

I'm sure I'll have to do some fancy diode matrixes... more help from MIDI controller experts would be great!

TIA!

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