If you switch between low and high you may need to retune a bit. Can't say for sure as I don't own a demon. No biggie, just keep the same tank on it all the time and you'll be rockin.
ETEK 3LT, with 14" Ti boomstick and cure 3 + bolt F/S
Vanguard creed eyes, membrane, bolt pin, detents F/s[/color]
Old school angel poppets/cup seals, spring detents(not sure which models) F/S