How to play in tune on the double bass? Rx: You want to play in tune. Consider hand shape, shifting, and playing with a drone.
Perceiving sound through your skin Rx: You do not trust the sound that comes in through your ears. Perhaps you have hearing loss or tinnitus. You still want to play in tune.
Improve intonation in the middle positions below thumb position on the bass Rx: Improve intonation in the area below the octave, just before getting to thumb position.
Increase your confidence and intonation on the double bass Rx: Improve accuracy and confidence in intonation, so you are not guessing at where notes are on the upright bass.
Playing in tune in thumb position Rx: Once you get through the transition, play in tune up into thumb position.
Stop noting hand collapsing issues Rx: Poor intonation that isn’t related to shifting. Also, lack of speed. A mirror or video is useful to see if your noting hand is collapsing which would lead to this problems.