The Phoenix amp is back from being serviced, the interference problems were all to do with poor earths and dirty connections. It's screwed down tight and all cleaned up, so now it's silent right up until the point where some oaf sends a guitar signal through it. Then it sort of stops being silent. The tonal range is gorgeous, all analogue, and it has it's own scorched overdrive. Me happy bunny. On the banging and hitting thing front, the cajon is now in a bag with a folding stool as a stand so it gets played with heavy brushes and the plywood side up. All I want now is some talent.