It’s a little more complicated than that.
The first step is to accept that it may take a while and to have fun with it. Allow things to be messy. I’ll be referring back to this shortly.
Firstly, establish what exactly you’re looking to do. Be specific. No matter how difficult or “unrealistic” you may or may not think it possibly could be. For example “I want to be able to pick anything at any tempo with all dynamic option available to me” or “I want to be able to do everything with ONE grip” etc etc. Basically, be specific before you just start willy-nilly going with “what feels good”. What may feel right may not get you what you want, or at least may be a long and unnecessary road to get there.
Secondly, find players who have the skills you want. Closely look at their right hand. If you’re an over analytical type you may dissect it and determine whether or not the have a “pronated” or “Supinated” arm position. “Trigger finger” “3 finger” or any other sort of grip. Etc Etc. If you’re not so keen on doing all that, than simply start by mimicking their grip. Look at what joints seem to be moving when they play, look at their posture, etc etc. Look at the details.
I recommend simply copying a persons grip because for me, ultimately there really aren’t going to be THAT many ways to accomplish what I wanted personally. How many ways can you hold a pick in which you can mute and play open strings without totally changing the playing position? How are you going to get accuracy if too many joints are involved? Etc etc
So what you’ll notice is that the guys that really 'Have it" have pretty much the exact same grip. The examples I’m going to use are Andy Wood, Kevin Heiderich and Anton Oparin. They all have reached the pinnacle of alternate picking and they all have nearly the same exact grip and joint functionality. They can all mute or play open from the same position and they still have access to their fingers for hybrid picking without having to change grips.
The break down of this grip/joint function in my opinion is
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RELAXED trigger style grip. I personally think the way Troy shows it is WAY to tense. At least that’s what i ran into when trying to mimic his way of teaching it. You essentially want to relax your hand to where the fingers fall into their natural curvature and from there place your thumb upon your pointer finger.
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REINFORCE your pointer finger with the middle finger. This is INCREDIBLY important. It will limit the amount of involvement the thumb can introduce. Also, I believe it will increase the control of upstrokes by a small percentage. Mainly, we want to limit the thumb joints ability to get involved in our picking. This is MAJOR, do not ignore this. Credit goes to Anton for the gem. Really made a HUGE difference after YEARS of frustration.
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MAIN POINT OF CONTACT should be in the Pisiform area of the hand and on the saddles of the guitar where the strings enter., everyone is going to have slightly different anatomy so this is where you’ll have to play around and find something comfortable that doesn’t compromise the pick grip and still allows you to mute and play open strings. There’s room for slight variation here, but refer to the players mentioned as examples.
Now that we’ve established this much, we can almost talk about where TREMOLO comes in.
For developing this method of picking I recommend trying to stick to playing pretty much exclusively from the wrist. Getting too many joints involved will just complicate things.
From here, try to start a tremolo. Stay RELAXED and make SURE you’re picking in a STRAIGHT LINE through the string. Do NOT try to do a “downstroke escape” or an “upstroke escape” focus on picking EXCLUSIVELY from the wrist and picking in a straight line. Watch for forearm rotation creeping in and finger joints getting involved. If you’re having trouble grasping the idea of picking with the wrist joint, think of it like opening a jar of peanut butter. If feels weird you may have too much wrist extension. My wrist doesn’t like to pick from an extended position and prefers a neutral to slightly flexed position. Experiment with that.
Once you feel like you’ve gotten this “okay”, see if you can mute/unmute or play softer/louder WITHOUT change your grip or shifting your hand TOO much.
Get this than someone can explain string crossing.