Ok gave it a shot as I was curious. Only have a LSS... setup was Ch 2, Gain @ 12, Master @ 9, output @ 9, no drive. Was using a 2x12 vert cab with an EVM12L and a Eminence Lil Texas. Tried both 5 & 15W modes. To my ears it did appear there was a volume change. Not huge, but definitely a noticeable increase. With the drive on, and generally more compression the vol increase was less distinct but still there.