hey i use a Hartke Kickback 12 combo (120 watt) and it comes with a "unique shape control" that changes the sound and gives "different tonal options", not sure what this means but i do kno it shows what i think is different frequency levels that could be enhanced with the control. also the shape control can be enabled or non-enabled with a switch on the amp. it also has a simple 3 eq knob set (bass, mid, treble). currently i have the shape off and bass and treble at +4 and mid at +2 (these controls range from -15 to +15). I like lots of different types of tones, anywhere from Geddy Lee sounding or John Entwistle or Kris Novoselic to a round deep sound (cant think of any bassists off the top of my head with that type of tone). In other words, i like many sounds whether trebley and bright to warm and deep. I was wondering if anyone could give me different eq presets that produce different sounds (including the shape control if u kno how it works). thanks so much for ur time and advice.