I relistened again, and the recording quality is pretty good. Now there is one thing that really caught my attention, and it is likely tricky to work on: the bass often is lagging behind. That is particularly noticeable with short isolated staccato notes. Of course that is partly in the nature of low reeds and takes a lot of practice to counteract (essentially tone production must be automated to a degree where you can focus your timing on the onset of the notes rather than on the action of your fingers). And to make that more complicated, this is specific to acoustic accordions, different from instrument to instrument, and not similarly a problem with digital accordions.