PlatinumVerb provides the following early reflections parameters.
Predelay slider and field: Set the time between the start of the original signal and the arrival of the early reflections.
Extremely short: Predelay setting can color the sound and make it difficult to pinpoint the position of the signal source.
Very long: Predelay setting can be perceived as an unnatural echo and can divorce the original signal from its early reflections, leaving an audible gap between them.
The optimum: Predelay setting depends on the type of input signal—or more precisely, the envelope of the input signal. Percussive signals generally require shorter predelays than signals where the attack fades in gradually. A good working method is to use the longest possible Predelay value before you start to hear side effects, such as an audible echo. When you reach this point, reduce the Predelay setting slightly.
Room Shape slider and field: Define the geometric form (the shape) of the room. The numeric value (3 to 7) represents the number of corners in the room.
Room Size slider and field: Determine the dimensions of the room. The numeric value indicates the length of the room walls—the distance between two corners.
Graphic display: Shows changes to Room Size and Room Shape parameters.
Stereo Base slider and field: Set the distance between the two virtual microphones that capture the simulated room signal.
Note: Spacing the microphones slightly farther apart than the distance between two human ears generally delivers the best, and most realistic, results. This parameter is available only in stereo instances of the effect.
ER Scale slider and field (Extended Parameters area): Scale early reflections along the time axis. This simultaneously influences the Room Shape, Room Size, and Stereo Base parameters.