0-7
This parameter selects the type of reverb. 0–5 are reverb effects, and 6 and 7 are delay effects.
0-127
This parameter is used when the Reverb Character is set to 6 or 7, or the Reverb Type is set to Delay or Panning Delay (Rev Character 6, 7). It sets the way in which delays repeat. Higher values result in more delay repeats.
0-127 This parameter sets the amount of the effect sent to the effect output.
0 - 127 (ms)
This parameter sets the delay time until the reverberant sound is heard. Higher values result in a longer pre-delay time, simulating a larger reverberant space.
0-7 A low-pass filter can be applied to the sound coming into the effect to cut the high frequency range. Higher values will cut more of the high frequencies, resulting in a more mellow effect sound.
0-127
This parameter sets the time over which the reverberation will continue. Higher values result in longer reverberation.
GS-compatible reverb parameters.
Also see GSReverbProcessor to see how to implement a custom GS-compatible reverb processor.