...forthcoming from Naxos, these are all very late works (1905; 1912; 1915):
https://www.jpc.de/jpcng/classic/detail/-/art/violin-sonatas-nos-4-6/hnum/11798990
It's nice to see these get more attention. The 6th has been recorded a number of times. There's also a recording of all six from Thorofon, with Ursula Maria Berg and (who else) Oliver Triendl. I have that set, but another is certainly welcome.
I know I like his 6th very much, and it's good to see them receiving more recordings. I wish Naxos would do this for his possibly NLA string quartets (especially if they can look into the mysterious 5th quartet while they're about it.)