Hi eatsteel!
I havenīt got a G-1000, but as far as I know, its sounds were taken from the SC-88Pro, which is the modul I use and which has got a Lo-Fi 2 effect.
On the SC-88Pro the first effect controller changes the Radio Detune parameter, which generates a radio disturbance on the specified channel(s). This noise is intentionally generated even if there is no other sound on the channel. To paraphrase the manual:
"If the R.Detune, W/P Level, Disc Nz Lev, or Hum Level settings are raised, there will be noise even when the input sound is silent"
I suppose itīs the same with the G-1000, so nothing to worry about!
Patrick