Perform-V has been a big hit, but people have commented that the buttons are just too darned bright!
We've released a firmware update that allows you to dim the buttons.
That same update also allows you to mute incoming Aux signals and not mix them with your vocals at the main out. (the second most requested feature)
Get the update via VoiceSupport at www.tc-helicon.com/products/voicesupport/