I was in a band called 11.59 back in 1973. We used my m400 extensively wherever we went, and on our album "This our Sacrifice of Praise." One of the best things ever was when we played at a church in Onslow Square in London. They have a fantastic organ there, and the combination of full throttle Church Organ and 8 Choir booming through the PA stirs the soul I can tell you.
Andy K