Whenever I have to alt pick fast or tremolo pick, I have a tendency to anchor my picking hand with my pinky. When I'm not playing anything fast then I dont have this problem, but if it is at high speeds then I cant help but use my pinky.

Any tips or suggestions to help?
A lot of people do that, I don't think that's bad. In fact I've heard that you should do that.

You shouldn't have asked the Pit though.
This should go in the electric guitar section.

I use my pinky to anchor my hand all the time, I never found anything wrong about that. Some players just rest the hand on the guitar's bridge instead, how about that?
how is it a problem?

i do that. as long as it doesn't affect how fast you play then it seems fine.

or maybe i'm not understanding what exactly you're saying...
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