E. Tone is muffled

For a "direct" setup, most cab and mic combinations sound muffled for high gain. Simply turning up the treble might not do it. Use all your EQ options at your disposal to dial in the high end. (See "EQ" section)

Note that trying to dial in the high end for an amp/cab/mic combination that happens to be very muffled-sounding will just give you a very noisy high-end that sounds artificial or processed, or fizzy. Dialing in frequencies that were never there to begin with means you are just amplifying noise. Thus, cab and mic selection is important.

I usually use the SM 57 off axis mic, as it sounds the most natural to me, with rich mids and highs. But you may want to try the SM 57 on axis mic; it has the cleanest and brightest high end.

My favorite cabs are the Hiway, Treadplate, Greenbacks, Uber, and XXL 4x12's. Of these, the Treadplate is very bright, the Uber, Hiway, and Greenbacks are relatively balanced, and the XXL is very boomy. I like to use parametric EQ's to neutralize the extreme parts of the cabs, and/or dial in the mids. See cab and mic selection.

For a "live" setup, I like to use "no cab" as my cab. Even if you do not use "Studio/Direct" output mode, selecting a cab will use "live-voiced cabs" (see "output modes" section). These tend to reduce the high end. Also, the "pre" versions of the amps tend to have more mids and less high end, although I wouldn't consider them "muffled" - you just have to EQ them a bit differently. Just because you are using a real guitar power amp doesn't mean you're guaranteed to prefer using the pre-amp only model more than the full model (see full vs. pre).

Top of Troubleshooting

F. Distortion is muddy/fuzzy/farty

I have to wonder if Line 6 modeled these amps using a guitar with really bright pickups (or vintage pickups with low bass response). When you use what I consider "normal" or "full-range" pickups, the distortion tends to be a little dirtier and fuzzier than tight and djenty, even on the high gain amps. If you fall into this category, you can use a distortion effect as an overdrive or an EQ effect before the amp distortion to pre-eq the tone you send the amp, changing the way it distorts. See this section for more.

Top of Troubleshooting

G. Distortion is dirty/gritty

You may want to sculpt the tone before your distortion stage. See this section for more. Sometimes you want to send the amp more of a mid-range than high end peak frequency range to get a smoother distortion. This is particularly the case for power amp distortion with the Park 75 and JCM-800 models. If you turn up the presence control too much, you may notice the distortion seems to go splat or get real nasty, even on a single note high up on the fretboard that should be smooth and sing. I usually turn presence to 0% on the Park 75, because this is so bad. See the this whole page for more.

Also, note that the "pre" versions of the amps tend to be a little cleaner than the "full" version as far as their distortion character. While I prefer to use "full" amps and use EQ's and distortion sculpting to dial in my tone, it may yield better results for you to try out the "pre" amps. (see full vs. pre)

Or you can try turning down Master Volume or playing with the Bias DEP's on the full models. These can often reduce the dirtyness of an amp model's distortion and smooth it out.

You can also get some nasty distortion sounds if you try to chain multiple distortion phases. In the Pod, you can have a distortion effect distort, than the amp model's pre-amp, plus the amp model's power amp. If you're using a real amp and speakers, both of these can distort as well. Having serious distortion in more than one of these is likely going to create a nasty distortion tone. See layering distortions.

Similarly, if you are trying to use two distorted amps as a dual amp patch, and have them both panned to center (or both left or both right), they'll likely produce some kind of comb filter effect and sound pretty nasty. (see "dual amps" section).

Finally, you may be getting input clipping and your distortion is making it sound like a nasty amp distortion rather than digital clipping. See if your tone has clipping when you turn off the amp model and other effects. (see the "clipping" section)

Top of Troubleshooting