Pioneer Dj DDJ-200 SmDJ Controller for WeDJ and rekordbox - Manual (Page 31)

WeDJ for iPhone
31
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 Using Release FX of Pad FX
You need to assign one of the Release FX to a Performance Pad in
advance.
1 Press and hold down a Performance Pad that has an effect other
than Release FX assigned to it.
The effect turns on.
2 Press the Performance Pad that has a Release FX assigned to it.
The effect turns off, and the Release FX is added.