hi, i was just thinknig about trying something out...but i think it will prove to be quite expensive.. here goes. get some sort of (maybe 3 band) cross over to seperate my mono signal into 3 or so sections. get a 3 or so channel compressor such as a behringer mdx4600 or something to have a level and compression for each of the 3(or 4?) different frequency's. so i can have more compression on lower notes less on higher or whatever etc.. then patch them all back into a mono signal to my power amp (or effects return on my pre amp). but how can i get the 3 or 4 channels back into a mono signal??