I've read in the past it's better to switch your amp to standby if you are planning on coming back to it within an hour or so, rather than turning it off. Any truth to that? If so, what about an amp with no standby...is it putting lots of wear and tear on the amp to turn it on and off a bunch? I play 3-4 hours in the evening with 20-40 mintue breaks in between. How hard is it to mod an amp with no standby to have one? Thanks!