Dont know if a single 9V battery will fit inside the vey small S540 Control cavity.
I use the 24V mod on my MTM2. It uses two 12V batteries and together they are small than a single 9V one
They are very cheap actually. 12-15 euros (same in dollars I assume) and the sellers even include the 2 12V batteries (I ordered from two different ones already in Europe)
This. This is the reason I'm heavily contemplating going all-EMG in my live guitars again. I use 3 guitars live because of different tunings, which get cycled about 4 times during a 2 hour set. I'm sick of having my amp dialled in for one of them, so the other two suck :lol: Then I have to twiddle between songs (sometimes DURING songs)... It's not just because of the different tunings, it's because they just sound so dam different. Massively different low-ends (the guitar in Eb standard has a much bigger low end than the one in B, for example!). I could just buy 3 of the same guitar but... I'd rather just bring some uniformity between them by throwing 81's in them all.So I'm using the same pup in most of my guitars. A Duncan SH-14(Its a custom alnico V). I got tired of doing eq changes on my amp. Now since they all have the same voicing, I let the guitars themselves be the determining factor of flavor. Same pups, same settings, but they still have slightly different flavors.