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MIDI Out to External Device

I used VB .Net to create a virtual keyboard that produces MIDI signals. It works just fine when using the MIDI devices on my computer, but I tried hooking up an external sound module to my computer using an M-Audio USB MIDI converter. When I select it, I'm able to get the "MIDI Out" light on the converter to light up on every signal I send, but no sound is coming out. I tested the sound module with MIDI drum machine I have and that worked fine. I'm not sure if it's a hardware problem or a coding problem.

Here's the code I'm using:
***********************************
rc = midiOutOpen(hmidi, 1, 0, 0, 0)

midimsg = &H90S + ((noteList(note).note + basenote + interval + octave * 12) * &H100S) + (volume * &H10000) + channel

midiOutShortMsg(hmidi, midimsg)
***********************************
"noteList(note).note", "basenote", "interval", and "octave" are all just variables to send the note that I want. "volume" and "channel" just set the volume and channel, and I've made sure that the channel is set to the same as the sound module.

Please let me know if there's a simple (or a complicated) solution.

Thanks,
Blake
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