Can I use an external program, like a DAW, to send CC's to my TC-Helicon device?
You sure can! If your device responds to MIDI CC's (check your manual), you can use a DAW or any other program that sends MIDI CC's to automate the operation of your device.
This is great if you play to backing tracks. You can place CC messages in strategic locations along the timeline of your song and the unit will make changes to your sound automatically. Even if you just have a stereo track, you can still load it into your DAW and automate the CC's along side it.