I too was under the same impression (that an SACD transport needed a DAC from same brand to meet SACD playback licensing requirements) until I read about the PST, where it appeared they had found a way around this. However, as noted, unless their SACD playback is compelling relative to CD, what's the point? In re-visiting their website, it appears they have tightened up their language a bit (and cut the price by 38% for an August promotion on this relatively new product).Unfortunately I don't think you can use it as a SACD transport with another DAC, at least not one I know of. There's no standardized scheme and it technically violates licensing agreements to pass it unencrypted over I2S (you are supposed to use HDMI protocol), so PS Audio is cheating a bit with their proprietary solution. That said, I don't think it's a huge loss. Weirdly, I found the PS Audio to be less compelling on SACD vs. CD feeding my DirectStream DAC. While CDs on the transport sounded consistently better than their rips played via Roon/Bridge, I wasn't so sure about SACDs. My DSD rips sounded just as good via Roon, and on some discs I actually found the transport to sound a bit thinner and less involving than the rip. This was with limited experimentation of HDMI cables though.