In my experience the TI analog outs are a bit quiet for + 4 dBu inputs on sound cards, but this gives more head room incase of realy loud bits peeking out other equiptment. Perfectly usable at this setting.
At the same time the analog outs are a bit loud for -10 dBV inputs, you can get a hotter signal into your DAW or mixer this way if you need to hear something to live audition a sound etc, but your recordings are going to have less dynamic detail and clarity, about a 'bees dick' worth less.
Now if your sound card has a gain knob on the input your using then the input sensitivity is nominal (ie, you nominate the sensitivity by turning the knob) That would be cool if you were worried about the spdif being louder or softer, you can just set it to be the same.
Also I believe the spdif to be under control of the TI's volume knob, meaning there is some digital gain involved here. This will add to the purists dilemma of finding the most perfect untouched sound from the TI.
By the way I was once a purist but now believe the 'bees dick' is worth less in the overall picture of getting stuff done. I find the USB sound to be 99.9% of quality that the spdif has and I've got 3 stereo channels to play with.
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