FWIW, I've really been enjoying OS DSD conversion on the Holo Spring. NOS is obviously the main course but sometimes I want the attack and better extension of OS. It seems that in terms of clarity and a tendency towards brightness the modes go NOS < OS DSD < OS < OS PCM. The latter modes seem to have too much of a sharpening effect that becomes unnatural. But if you do want to do OS with Spring give OS DSD a try. Now I should mention that I do most of my music is either streamed from GPM or is 44.1/16. True DSD material sounds better in NOS but I still enjoy OS DSD.