I did some quick searching and found a bunch on the Harke 3500 head, but not quite what I was looking for, so here goes: 1. Is the compression any good on this head, I have used it at a low settings but haven't noticed the difference, I am not that great a player so I would thing that it would even out my rough playing if it was working correctly. 2. I play Christian rock at chuch (Edge service) what are you rockers (non Metal) using for EQ settings? 3. This Head is being left at church with the cab 4x10 harke also, but the master volume know is broken off. Anyone tell me how difficult it would be to replace the volume pot? Thanks in advance.