I dont know what it is about onboard pres, but I used my ATK in anger for the first time last night, at a practice room with a big Ashdown 4x10 combo. I couldn't get a punchy sound from that combo for love nor money, until I totally flattened the amps EQ, and added some bass boost and a slight treble boost on the bass itself. After that, bloody lovely tone. So, I guess it's probably all in the voicing of the preamp? Get a good preamp, onboard or not, and you're set.