Dont really know where to put this, so mods feel free to move it if needed. I've started playing upright in a band that does everything from punk to Americana. I'm comfortable with country, some blues, and have played bluegrass for yrs. I'm totally self taught, 55 yrs old, been a guitarist since high school. I started playing upright in a bluegrass context 20 yrs ago. My slap technique is good enough that Im happy with it. Whats giving me fits are rock songs with bass lines composed with slab. Two main issues, 1st being really fast 8th notes, typical in rock and punk, having a hard time keeping up speed, nice even timing, and getting right hand fatigue really fast. 2nd issue is a left hand one. A lot of rock songs have signature bass lines typically played on electric up the neck in closed positions. I try yo move them to 1st pos sometimes, using open str when I can, but its not always possible or they don't sound as good. I have a strong left hand, but I give out playing in closed position for a whole song, esp at faster tempos or more notey lines. I've tried doubling and switching over the electric on some of these tunes but I've never played slab that much, and I find my technique suffers switching back and forth a lot. I get heavy handed and make a lot of extranious noise on electric, esp right after putting down the upright. Plus that means carrying more equipment, like an amp(I usually just play upright thru the PA). So I guess what Im asking is for some exercises and techniques I can work on to get more fluid in the right hand playing fast 8th note lines, and get some better left hand technique to alleviate fatigue when playing up the neck in closed positions. I guess I could lower my action some, its not super low but not super high either, its about where I like it for playing country, bluegrass, and slapping. If I lower it more it will cut into how I play other stuff, and plus I imagine I would loose some tone and punch for my acoustic stuff. I use Tomastik Superflexible Solos.