Lappys… OK, you dont need one with some DJ playout systems, like the MCX8000 in Standalone mode, or with the SC5000 Primes… but generally, MIDI programs, like Serato, Virtual DJ and Traktor, all need a lappy running for the entire length of the show/slot.
Latency is of course something to be avoided. For newer members of the forum, and/or those new to DJing with a lappy… Latency is the lag between a button or other control being pushed or pressed or rotated, and the DJ software actually responding to that user action. If latency is low, such as 5milliseconds then the delay, lag, or latency isnt noticable. Of course, if the latency is more like 200milliseconds (a fifth of a second) then it’s a bit more noticable. You might well be pressing things, absolutely dead on the beat, but the lappy is responding a fraction of a second later. That sort of lag isnt noticable or important for those using a lappy for Word Processing or a nice spreadsheet, but for DJing…where split second timing is paramount… it’s very noticable.
So…you switch on your computer one morning…fire up the DJ software