Weekend project: Midi Volume Control

Spork Frog

I play keyboard in a local group that I'm part of, and we've had incessant problems with balance. I switch between regular instrumental patches and a percussion bank, and dynamically the two are not always lining up the way I'd like. I can use the volume knob on my keyboard, but it's hard to accurately and consistently switch between multiple volume levels.

So, I built this little box using a Propeller USB Protoboard and connected MIDI (schematics can be found here for those interested). I then wrote a little code so that when one of the top keys on the keyboard is pressed (keys I wouldn't normally use) the sent velocity changes to a set value. The theory is the box sends through all MIDI events except for "Note On" commands, which it captures and re-sets the note value to whatever the software wants.

I'm hoping to expand it by adding by adding a video ouptput and I don't know what else yet in order to add maybe some video effects or do some other fun stuff with MIDI in general.

Enjoy.
-Phil

SRLM

Hey, this is pretty cool. Very nice case too. Can we see inside? Did you use the circuit in the other thread exactly? I was approached recently about working on a carillon controller for my church: it did something or other with MIDI signals, so I researched and found that thread. I declined though since I was afraid that a) I'd be stuck with the project for years or b) that I'd fry some other piece of expensive equipment.

Anyway, very nice project. Perhaps a video or audio recording?

Chris Savage

Besides inside pictures I would also include a schematic (or is that in the SPIN code?). Nice project. Take care.

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Chris Savage
Parallax Engineering