Native Instruments MASCHINE MK3 Groove Production Studio (Black) - Manual (Page 752)

The Reflex reverb on the controller.
15.4.4 Reverb (Legacy)
This reverb is best for most common applications. The Reverb adds room information to the
signal, making it sound more spacious and natural. It is particularly suited to drum sounds,
but also useful to add a more “natural” sound for all sorts of other signals.
The Reverb panel in the Plug-in Strip.
Effect Reference
Spatial and Reverb Effects
MASCHINE - Manual - 752