Native Instruments MASCHINE MK3 Groove Production Studio (Black) - Manual (Page 751)

The Reflex panel in the Plug-in Strip.
The Reflex in the Control area.
Parameter Description
ROOM Section
Color At lower settings, the general sound is a bit more muffled; the
higher the settings, the brighter it sounds.
Smooth With this parameter, you can soften the metallic character of
Reflex.
Size Adjust the size of the virtual room here.
OUTPUT Section
Mix Mix lets you adjust the amount of the effect in relation to the
dry original audio signal.
Effect Reference
Spatial and Reverb Effects
MASCHINE - Manual - 751