Hi, I've had this same problem for 5 months since I started playing bass and I haven't found good information nearly anywhere on it. I was wondering if anyone could detail the specifics of using the right hand to mute the strings (NOT muted notes like "---x---" which a lot of information available will talk about). I play a four string bass and I've been using the floating thumb technique to mute the A-string while I play the G-string and to mute the E-string while I play the D-string. This works okay most of the time but there are a lot of songs that make that thumb just be in the way. I've tried using my ring finger of my right hand to mute the A-string but that gets in the way too. Now, I see a lot of people that keep their thumb anchored and move fluidly up and down the strings with their right-hand and do the majority of their muting with the left-hand. For example, they use their left thumb to mute the E-string at certain times, or keep the middle up, or...this is where my problem is--I'm not really sure what they do. I also would like to learn to slap bass better and I would need to learn this for that too--so having one solid sort of technique would be great. I watch videos of people online but they're usually too blurry, or fast to tell, and sometimes it seems arbitrary. I try to figure it out and, say if I'm muting the E-string with my thumb, my ability to play four note stretches on the A and D-strings are severely limited. If someone could help me out here with specifics like, "Mute the E with your middle unless you use it, then mute with thumb" or something. And any suggestions on how to develop it would be great. Thank you so much to whoever can help--this is a very distressing problem for me.