I'm a beginner to playing the electric guitar. I have a Les Paul copy and a 30watt Marshall MG30 DFX amp. I just cannot get that electric guitar sound that I'm looking for with that complex sound and a long sustain. Is there something else I need to purchase or is it just the way I have setup the amp. I have tried different combinations of bass, treble, pressed the dfx button etc but to no avail. Any suggestions anyone (nice ones please).