deadmau5 and Richie hawtin use the X1 in ableton too.. :P
anyway, very general question.
get a new mixer first. jk jk
go for the X1
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From my experience with TP2, I'd go with the 2D. I'm using two X1s to control Traktor at the moment, but find them lacking when using 2 Decks plus 2 Sample-Decks. 4 Decks is great, but you don't have any controls for the loop-recorder.
NI does make a custom mapping, but as I am using an A/C B/D-Layout for my X1s I will have to rebuild ALL the mappings. Why not then go the direct route and build a good mapping for yourself- alas the 2D with faders and stuff becomes much more interesting.
why are people still talking about the 2d, he doesnt need an audio interface......1d.....