KORG TouchView Trinity ProX - Manual (Page 121)

48: Reverb-Room
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e: ER Level
f: Reverb Level These parameters set the early reflection level and reverb level.
Changing these parameter values allows you to simulate the type of walls in the
room. That is, a larger ER Level simulates a hard wall, and a larger Reverb Level
simulates a soft wall.
Reverb - Room Type
Time
Level
Louder
ER
(Early Reflections) Dry
Reverb
Pre Delay Thru
Pre Delay Reverb Time