Yeah I do have the same problem when standing. Its not really a posture per se thing. I don't really slouch when sitting and the bass is fully supported by my legs. Its purely a problem with my arm/shoulder motion I believe. I used to stand with a rabbath end-pin. Its easier to vibrate on that thing, but its because of the bass angle: lower and closer, making the first position feel like fourth position does normally.
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Double Bass Help with Left Shoulder Fatigue due to vibrato
- Thread starter ABlueJazzBassist
- Start date
You could try sitting with a rabbath endpin or bent endpin. There are shortened versions of these for sitting, I plan to try this for chronic backpain while sitting (i believe to be helpful with angles of my right arm) very soon, specifically a laborie. Give it a shot if your bass is drilled out and you have an endpin.
Hey Craig, have you made any progress? I'd love to hear that everything is fixed! I've learned a few more things thinking about this and asking some questions if it is still painful 
