Hi, I'm planning to go busking with vocals, electric guitar and an electric bass player. I've been researching battery powered equipment but am fairly new to playing with the right equipment. I've seen a 3 channel input and xlr input battery powered monitor/mixer made by a company called Artec (PMD-8); would it be posible to use this as a way of amplifying ourselves on the street? Obviously we can make use of it as a monitor on stage as well. Reason being, a lot of the reasonably priced battery powered amps I've seen only have a couple of inputs and I really need three. Looking to spend around £100, £150 max.