There’s a June ‘20 post asking about saving specific instrument settings with each song. I don’t see a follow up to the original post but the concept might become more important as more instruments and rhythmic options are added and users want to be able to move between songs efficiently.
This feature will be released in the same update as the new strumming patterns update I’m working on. With many more instrument options available, it is indeed going to be vitally important to have per-song options! So I’m building that into my redesign.
I was hoping to have them out this fall, but since I’m now unable to start recording in earnest until October, I’m starting to think early 2022 might be more realistic. (Working on a different new feature in the meantime, though! More on that soon.)