You can get 24bit via the spdif and since you've slaved to it you can send the audio in sync.
Ps technically if your running the TI asio the TI is the master sync. If your running a third party asio and using VC then it might be good to set your TI to sync from the spdif of you other sound card BUT it is impossible while the USB cable is plugged in. The TI syncs to the computer via USB and I'm guessing it defaults to 48 and follows the asio driver of the TI or the VC. This last point I'm only guessing.
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