if you check the VCI400 quick start manual here:
http://serato.com/dj/downloads
you will see that the mapping does not include slicer mode
thats a big wow for me, I bet a lot of 400 users would have been assuming that was coming… it does exist in the ddjsx right? surely it is not some kind of deal with pioneer
imagine if they were to release mappings of Twitch/VCI380 without it?
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