I just bought a Perform V about a week ago.  After hooking it up, there is a ground hum (about 80 hertz) coming out of it that I can't get rid of.   Here are a few notes about the setup:

Shure ULXD24/KSM9 > Perform V > Mixer (input>onboard compressor>onboard EQ).

1.  The input is all the way down and distorts if I turn up the gain at all.  I've trimmed down the gain coming out of the wireless receiver and it is working ok as far as input/distortion.

2.  I've swapped out the mic cables and checked wiring to make sure it isn't a problem with the cables.  Same result with all cables.

3.  It seems to be slightly less prevalent after a reset of the unit.  As soon any presets are loaded, it gets worse.  This is the case even without the preset being selected or HIT being on.  

4.  In order to get the mic up to an acceptable level on our sound system, we have to turn up the gain/fader which in turn amplifies the hum.  

5.  The firmware is updated to the most current version.  

Can anyone help?  Could this be a line/mic level signal problem?  It's a pretty neat little unit and I want to use it, but the hum makes it useless.

I have one of the first TC Helicon Play Acoustic you could get in the USA. So new, in fact, they didn't even label the buttons correctly! That said, it hit the ground running with me and has made this working musician thousands of dollars. I've loved it's simplicity (I ditchted the mixing board for it!). I don't use nearly all the features. In fact, I only use it to route and sweeten me and my guitar. It has been a workhorse and has never let me down. Lately though, towards the end of the night, I swear it starts adding a bit of far off background vocals to the signal. At first, I thought it was patrons singing along, then I notice no one is singing. I've had a few folks ask me about it and frankly I am a bit puzzled. See, I don't use any of the harmony capabilities of this unit. Just straight up guitar, with some body rez and a little reverb on the voice. That is all. So... I wondered if anyone else has ever noticed any mysterious "voices" in the output of their Acoustic Play? It is very subtle. Just enough to make me question my sanity. Anyone?

Hallo ich suche verzweifelt einen Weg Backingtracks per Midi zu starten. Ich benutze das tc helicon voicelive 3 extrem. 

Auch wenn ich den Start auf ein Taste lege, die sonst über Midi steuerbar ist, verliert diese Taste ihre Midi Fähigkeit. 

Meine Host App ist songbook+ auf dem iPad. 

Hello I am desperately looking for a way to start backing tracks via midi. I use the tc helicon voicelive 3 extreme.

Even if I put the "start" on a key that is otherwise controllable via midi, this button loses its midi capability.

My host app is songbook+ on the iPad.

I bought a TC Helicon Harmony G-XT a few months ago.  During my last recording sessions it worked fine.  After writing new songs to record I hooked up the rig and now signal from the microhone to the mixer.  I thought it might be the guitar needed to be hooked up to activate the mic.  The guitar plays through to the mixer, but still no mic. 

Is there some setting that I am missing that is keeping the mic from working?  Does the mic input just stop working?  I have replaced both XLR cables with new ones and still no signal to the mixer.  What am I missing?

I am so [email protected]#$ pissed off at this thing right now. I've read the manual in excrutiating detail and CAN NOT record over a previsouly recorded sequence. I have tried everything I can think of. Hit the RECORD button, let it RECORD over the SEQUENCE, hit the STOP button. I go to track view and make sure all the SEQ marks are missing. I"ve tried saving it and not saving but no matter each time I end the recording/Sequence/Backtrack. Then I switch to a new track and right back to the one I was working on and there are the same old SEQ marks that I just saw were deleted when I recorded over them. And can anyome tell me what a category TC-Helicon claims a VL3X is? What a STUPID way of referencing. Why don't they just have VL3X in the product category. Sorry, I'm just really PO right now. Any help would be appreciated. 

Hello

Talk box synth has crackling that comes and goes when using with an electrovoice mic.....and is fine when i use a shure.  Sometimes when the crackling happens the talkbox switch indicator flickers and lights up for a moment.  Swapped out all of my cables and is still an issue.