Re: What's the best & easiest way to thicken up O/D channel?
Do this:
Put your guitar's volume and treble on ten. Start with everything on the amp at 5. Turn up the bass until you get enough bottom end. Turn up the mids and treble to 10. Turn down the treble until it sounds too dull, then turn it back up just a little bit. Turn down the mids only if it sounds boxed in. Put your preamp/gain down to nothing and turn up your post / volume up to 7. Turn your gain up just enough to get a gritty sound. If you hear noise / hiss /static / garbage, it's up too much. If it lacks sustain or sounds weak, then turn it up a little. Adjust the postamp / volume to match your clean channel.
If you're using a pedal, set it to overdrive instead of distortion if you can. Instead of turning the gain up, use the pedal as if it were a clean boost, then turn the gain up just enough to get the right amount of additional overdrive if you need it. Dont' EQ with your overdrive pedal - set everything to 7, except for setting the mid scoop contour to zero.