Using an external D:AC with the TacT 2.2XP going into one of its analogue inputs seems an odd choice, given that all incoming signals are processed in the digital domain for the purposes of RC. I tried it with an old (but still very good) Trichord Pulsar D:AC 1 and the character of the system didn't change at all.
As mentioned previously, the 2.2XP can sound very good indeed once you finally get it tuned exactly right, though it does seem to highlight the worst of less than great recordings as much as it highlights the best of good recordings. It isn't at all forgiving and assuredly won't make your entire collection sound wonderful, hence your relationship with it can tend to be a mixture of love and hate. But, with the right recording, the right company, a glass of your favourite tipple and a fair wind, it can sound superb. Just don't expect it to sound that way with everything and anything you may play through it.
As mentioned previously, the 2.2XP can sound very good indeed once you finally get it tuned exactly right, though it does seem to highlight the worst of less than great recordings as much as it highlights the best of good recordings. It isn't at all forgiving and assuredly won't make your entire collection sound wonderful, hence your relationship with it can tend to be a mixture of love and hate. But, with the right recording, the right company, a glass of your favourite tipple and a fair wind, it can sound superb. Just don't expect it to sound that way with everything and anything you may play through it.