Still awaiting a response from TC Helicon Support on this so I thought I'd ask my fellow users.
This is my first VoiceLive Unit, but by no means my first modeling device. I seem to be having an issue with additive noise coming from both the XLR and 1/4 inch guitar outputs where there is an annoying high pitched tone like when you hear feedback from a mic is on the verge of happening. It seems to be the most obvious through the 1/4 outputs that connect directly to my guitar amps effects return.
The incident goes away when all the effects are disengaged and is most obvious with gain staging effects such as the drive or compressor with makeup gain at default +13db.
I've had the unit for about a week now and can get by using an acoustic guitar with the output signal coming only through the XLR outs. But when I split the guitar signal off through the 1/4 inch outputs, it is unbearably tiring to hear the high pitch whistle at rest. Sure the noise gate is trying to suppress it, even with the gate closed, but that's another issue.
There seems to be no way to get rid of the annoying static sound that happens when the gate opens when threshold is reached on the noise gate. My Digitech GNX4 while coming up on ten years of age has a very "natural" sounding noise gate that doesn't exhibit a static sound when opening and closing. Note I have tried going through three different guitar amps both through their effects loops as well as into the front input jack. Each have the same result.
Have tried different cables (which work fine with my other gear) and all yield the same result. Just wondering if I should try exchanging it or if this is a common issue that others don't seem to notice. Once again the problem goes away when the effects are disengaged and it is more obvious as gain stages are increased.
If I can get passed this hurtle, I'll really be loving this unit because it really is an awesome concept when all goes well.
*edited for line spacing so it's a bit easier to read -Craig