Lexicon LXP-15-II Owner's Manual page 29

The Algorithms
Size: Sets the rate of buildup of diffusion after the initial period (which is set by
Diffusion). It also acts as a master control for Decay. Because of this link, Size
changes a reverb sound from very large to very small. Generally, you should set
Size before adjusting anything else. The size in meters is roughly equivalent to
the longest dimension of the space you are trying to create. Note that changing
Size temporarily mutes the outputs.
Diffusion: Controls the degree to which initial echo density increases over time.
High settings of Diffusion result in high initial buildup of echo density; low settings
cause low initial buildup. Echo density is affected by Size — smaller spaces will
sound denser. To enhance percussion, use high settings of Diffusion. For
clearer and more natural vocals, mixes and piano music, use low or moderate
Diffusion settings.
LFO Rate: Adjusts the rate of the internal Low Frequency Oscillator. Note that
in order to hear the effect of changing the LFO Rate, the LFO must first be
patched to control some parameter in the algorithm.
Reverb Mix: Adjusts the mix of reverb with glide delay effects. You can listen to
the glide delay output without any reverb effects by setting Reverb Mix to 0.
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