Looking into high end performance I encounter a weird sync issue with Digi connected to a Naim Audio DAC. after a minute into each track there is a short interruption in the playback, the DAC's sync LED goes off, then the music comes back but the DAC stays "out of sync" - I guess that means that it's RAM buffer kicks in.
I tried it with all kernel profiles; various playback configs; 44.1, 48, 96, 192 kHz; 16, 24 and 32 bit. The issue is consistent.
S/PDIF via Toslink
Naim Audio DAC