I have a Hartke 3500 head, two 4x10 hartke cabs and a fender p bass. My band plays a mix of rock and blues. I like the tone I get on the rock stuff but I can't seem to get the right nice warm, rounded tone I need for the blues. Does anyone know of a particular piece of equipment (i.e. a particular effects pedal) I can use in my setup to help me produce a good "bluesy" tone? I thought maybe a good compressor would help and the amp has a built-in compressor. However, I've read in these forums, and am inclined to agree, that the hartke built-in compressor is not very good. Any suggestions would be greatly appreciated. I'm open to anything. Thanks.