user23553: My project is basically a set of 5 audio signals (analog) that get altered slightly by Arduino Uno. I convert to MIDI and would then output it to USB, so that it can be used in a program of my choice on the computer. I found a vaguely similar project online with a guide. In that project they write a serial to a MIDI out, and then plug that into a computer. I'm fairly sure I can't just use the TX and run that into the USB, that wouldn't work. So I'm looking for an alternative method.

user4143: Not with an Uno, no. You can only use USB Serial (CDC/ACM) through the on-board USB chip[1].
Your best bet is probably with a Teensy 3 (or 3.1 or whatever they are up to now) which has built-in support for USB MIDI emulation.

1: I believe there is MIDI firmware for the USB chip on the Uno, but installing that requires a hardware programmer and then breaks the normal sketch upload.

23553: <p>My project is basically a set of 5 audio signals (analog) that get altered slightly by Arduino Uno. I convert to MIDI and would then output it to USB, so that it can be used in a program of my choice on the computer. I found a vaguely similar project online with a guide. In that project they write a serial to a MIDI out, and then plug that into a computer. I'm fairly sure I can't just use the TX and run that into the USB, that wouldn't work. So I'm looking for an alternative method.</p>
 4143: <p>Not with an Uno, no. You can only use USB Serial (CDC/ACM) through the on-board USB chip<sup>[1]</sup>.</p>

<p>Your best bet is probably with a Teensy 3 (or 3.1 or whatever they are up to now) which has built-in support for USB MIDI emulation.</p>

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<p><sup>1: I believe there is MIDI firmware for the USB chip on the Uno, but installing that requires a hardware programmer and then breaks the normal sketch upload.</sup></p>
