“Our first test was with the Blue Blueberry which we know very well. Plugged it in and the M63 made it sound like a U47! Needless to say we were blown away — the Blueberry has never sounded so good! We then plugged in a Bock 251. Ouch! @#$%^& Absolutely amazing! I don’t have words, pure magic and a lot of smiling faces.”