a Rangemaster WILL sound overly trebley into an amp set for your usual tone but if you listen to the normal channel of a plexi or a non-tb AC30, they ARE very bassy (hence the use of a treble booster).
The way to use them is to switch them on then dial in your EQ - they're generally not much cop as solo boost pedals over your normal tone since they will make the tone too trebley. If you mod them for a full-range boost then they're alot better as solo boosters.
I've been using mine with the Randall Titan and it sounds excellent - just turned the treble down on the amp.
:twisted: