Adding reverberation
Like other synthetic reverbs, the plugin's "Predelay" knob adjusts the length of time before the reverb kicks in with early reflections of the incoming audio echoing off the walls of a virtual room. The longer the delay time, the larger that room appears to be. As those echos bounce about, they scatter into a random collection of indistinct echos that form the tail of the reverb.
The "Density" slider on the right adjusts the density of scattered echos in the reverb tail, while the "Spread" slider adjusts the width of the stereo image as those echos bounce left and right. The "Attack", "Decay", "Sustain", "Hold", and "Release" knobs at the bottom of the plugin adjust the timing and sustain level for a volume envelope that shapes the rise and fall in volume of the reverb tail.
The "High Cut" slider controls the cutoff frequency for a low-pass (high-cut) filter that reduces the volume of high frequencies as echos bounce through the reverb tail.
To reduce boominess in the reverb, the plugin processes high- and low-frequencies separately. The "Crossover" slider sets the frequency dividing high from low, and the "Low Freq Level" slider cuts (or boosts) the volume of low frequencies before they are processed for reverb.
Additional controls adjust a delay on the dry signal and the wet/dry mix