i use a pedal, my amps dirt channel sounds like meshuggah its to tight,
That's why I use a big muff.
I'm a big fan of low wattage, single channel, class A, all tube amps. Of course, since it is a single channel, you can't step on a footswitch for an overdrive, unless it has a boost, but usually that just increases the volume.
So what I do, is I set my gain to the point where it is just a little bit crunchy. That way, if I am playing something like dirty blues or something Hendrixish, it is perfect for that. If I want to come across clean, I can just back off my volume knob on the guitar a little bit and it cleans up nicely. If I want to have some heavy overdrive, I hit my big muff and it takes me where I need to go.
You can get some pretty good "distortion" out of a big muff, but I use it strictly as an overdrive/sustainer. I'm not really into the kind of music I would need a distortion pedal for.
Be well,
Doc