Sorry,both posts as confusing as each other. End of the day you DO need a mic to make the Heil work but yes it can be your normal vocal mic. If you dont use one currently, you will need one. The closer the tube is to the mic, the better it works.
Config as follows:
Gtr>Efx>Amp> Speaker out of the Amp> Talkbox> Speaker
You need to be careful as the talkbox is taking the initial speaker load from your amp (at I think 8ohms, could be wrong).Impedance mismatching can cause damage to your amp. There are many old rock nroll stories about roadies blowing up amp heads with talk boxes.
Once the tube is in your mouth you dont need to sing, just mouth the words or sounds you want the talk box to make.
I had one many years ago but frankly it was a pain in the ass for one or two songs. Any more than that is overkill. At the time I was sometimes doing 2 gigs a day and I opted to go for the most simple (and least room for error) setup I could which was wah/chorus/delay/amp....simple but effective.