Hi, I tried searching but got hundreds of hits, apologies if this has been covered already (I'm happy to read existing threads if you can point me in the right direction). I don't understand how I should use the Gain and Master controls on my new amp (a Rumble). I read that some players like to keep the Gain maxed and control volume using Master; others seem to do the opposite. I cannot hear a difference between these two approaches; they sound exactly the same in my amp. Not knowing any better I keep the Gain mid-way, and control volume using the Master. Perhaps it doesn't matter?? BTW I don't gig with the amp (in church I go into a DI and my output is controlled by the sound guys). I don't use the amp's built-in distortion, nor do I run any pedals. Any help appreciated! Peter.