Your more than likely hearing distortion coming from the horn on your cab. If you have a level control then try turning that back so it won't crackle.
At one point my settings got wiped out by a ravaging guitard playing a joke on me so the first thing I do with my SVT is zero everything out on the parametric and graphic equalizers, give it some master volume, and run the pre-gain up just until you start seeing the dreaded yellow LED of death (then run it back a tiny bit). Zero your graphic EQ out @ +0- (same for the volume level for the graphic EQ) and start cutting frequencies until you get a nice neutral unbooming tone from the parametric. Next run your compression up to about half in order rein in any ugly frequencies that you can't seem to get under control. After obtaining a good natural sound it's time to start adding your own flavor with the parametric EQ (this is especially true in the 5 position mid selector knob). I usually don't mess with the "Boost" circuits unless I'm trying to compensate for the acoustics of a room and even then I'll tone down my graphic EQ to bring it in check. Now that you've got a nice sound going, run your compression up until you feel your getting even string responce as you can achieve without sucking up too much low end. Finally bring your master volume up until you can really get a sense of your tone and stage volume and adjust your pre-gain accordingly by the yellow LED of death (Clipping indicator).
Personally, with my rig - 2 610HLF cabs / SVT4 PRO - if I start getting greedy with the graphic EQ that will only lead to clipping and blown horns/woofers. So as a caution adjust your compression according to your tone, not over all volume. Most people will sacrifice their compression for volume and at that time it's time to move to a larger cab or even better a pair of good cabs since I believe the SVT was made for touring musicians that are usually running their rigs in stereo to two seperate cabs or bi-amping. You've got more than enough power to murder small mammals so pour it on according to your cab and adjust your compression / EQ to get the most out of the components.
I play similar music so if your still interested I'll take a couple of pics of my settings when I get to our rehearsal space.
At one point my settings got wiped out by a ravaging guitard playing a joke on me so the first thing I do with my SVT is zero everything out on the parametric and graphic equalizers, give it some master volume, and run the pre-gain up just until you start seeing the dreaded yellow LED of death (then run it back a tiny bit). Zero your graphic EQ out @ +0- (same for the volume level for the graphic EQ) and start cutting frequencies until you get a nice neutral unbooming tone from the parametric. Next run your compression up to about half in order rein in any ugly frequencies that you can't seem to get under control. After obtaining a good natural sound it's time to start adding your own flavor with the parametric EQ (this is especially true in the 5 position mid selector knob). I usually don't mess with the "Boost" circuits unless I'm trying to compensate for the acoustics of a room and even then I'll tone down my graphic EQ to bring it in check. Now that you've got a nice sound going, run your compression up until you feel your getting even string responce as you can achieve without sucking up too much low end. Finally bring your master volume up until you can really get a sense of your tone and stage volume and adjust your pre-gain accordingly by the yellow LED of death (Clipping indicator).
Personally, with my rig - 2 610HLF cabs / SVT4 PRO - if I start getting greedy with the graphic EQ that will only lead to clipping and blown horns/woofers. So as a caution adjust your compression according to your tone, not over all volume. Most people will sacrifice their compression for volume and at that time it's time to move to a larger cab or even better a pair of good cabs since I believe the SVT was made for touring musicians that are usually running their rigs in stereo to two seperate cabs or bi-amping. You've got more than enough power to murder small mammals so pour it on according to your cab and adjust your compression / EQ to get the most out of the components.
I play similar music so if your still interested I'll take a couple of pics of my settings when I get to our rehearsal space.