There is no digital output for SACD. The digital ouput is only for the CD layer. If you don't play hybrid SACDs, then you won't hear anything. Sony/Philips hasn't released the specifications yet.
I'm with kr4. I'd wait until 1)there is a digital out on SACD players and 2)TacT comes up with the software to handle the processing. What's the point of taking a hi-rez format and converting it back to redbook(or whatever bit/sampling rate the TacT would use)? For what it's worth.
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