Hey! As Radu said, a video would be super helpful, but a couple of key points to get your left & right hand synced up:
- Play really, really slow & give each individual finger the same ammount of strength & purpose - when you feel like you could speed up - fight the urge & stay slow!
- Do the above to a metronome and be very strict with yourself, if there are any slip ups, take time to correct them until they feel comfortable & controlled at a slow speed.
- Treat this like you're taking 2 robotic hands through the sequence, programming every muscle movement you need, slowly first, so that when you speed up, everything is in place.
- A way to tell of you're synced once you feel you've practiced enough: Speed up and record yourself, then slow down the footage & see if there are any slip ups.
I guess the basic difference between synched and unsynced is that your right hand may pick before your left hand has made the decision to move to the note you want to play (or vice versa) this usually happens when playing at a tempo you might not be ready to hit, as you'll be more likely want to rush through the lick to bring it to that speed. Its the difference between 3nps patterns sounding like a well oiled machine or sort of unbalanced, where one side is still catching up with the other. This can be easily disguised when it's a flurry of distorted notes so it's best to slow down and calibrate, cause that will give you the speed & clarity but most importantly the control over every note you're playing. Control beats & breeds speed