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What i want to know is, can you set a midi track to control the units where the harmonies kick in and out without having to click the foot switch?



yes or no, depending on the unit's capabilities. Most of the TC Helicon and Digitech rack units are totally MIDI controllable, (not sure how they handled the new versions that are like foot pedals...)

I have a Digitech Vocalist Workstation SX and a TC Helicon Voiceworks. I like the audio results of the TC Helicon better, but I think the MIDI implementation of the Digitech is much easier. (at least in Sonar it is... the digitech can be programmed from virtual instrument menus, whereas the TCHelicon requires me to manually enter parameters to the continuous controller entries, which is inconvenient and non-intuitive)

One recurring problem with all of these units is that they tend to pick up extraneous noise and then it gets into the mix. Here are some tricks to minimize that problem:

1) For live performance, use a noise gate or volume pedal to turn the MIC volume down except when you are singing directly into it.

2) I was told that the Shure SM58 Beta is a good mic for use with vocal processors because it does a better job than many other mics at filtering out miscellaneous noise (I know that's a very non-technical description... but I started with a different Shure and was ready to abandon vocal processors altogether, and when I got the SM58beta I started having better results. YMMV)

3) for home recording, I get best results if I sing while listening to the backing tracks through headphones, so the background does not get captured by the mic. I haven't had good luck trying to play guitar and sing at the same time while recording.

4) You can also sing directly into the recorder then re-route the recorded vocals through the vocal processor, and re-record the processed output. That approach lets you start with a dry track and experiment with it until you like the results

https://www.dropbox.com/sh/ey71h8ep047758h/AAC12jNM0Hz9Q8zsh5iDeqNHa?dl=0