Lexicon DC-2 - Manual (Page 9)

Effect An effect is a configuration that determines how the DC-2 will process
an input signal. The DC-2 can contain as many as 24 effects: Panorama,
Nightclub, Concert Hall, Church, Cathedral, Party, 2-Channel, Music Surround,
Music Logic, Logic 7, TV Matrix, Pro Logic, THX Cinema, Mono Logic, 5.1 2-
Channel, 5.1 Music, 5.1 Logic 7, Dolby Digital, THX 5.1, DTS 2-Channel, DTS
Music, DTS Logic 7, DTS Film and DTS THX 5.1.
Parameter Each Effect has a set of parameters (controls) that characterize it.
Parameter settings can be changed to customize each Effect for your room
and listening taste.
Effect Parameter values are stored/recalled with each Effect. Some examples
are: Subwoofer Level and Vocal Enhance
System parameter values are not associated with a particular Effect and their
values do not change when a new Effect is loaded. An example is: Speaker
Configuration.
PCM FX The term PCM FX (Pulse Code Modulation Effects) is used to
describe all of the effects which are compatible with two-channel input
signals (analog or digital).
Two-Channel We use the term two-channel rather than "stereo" because a
two-channel input can contain monaural, stereo or matrix-encoded stereo
sound depending on how it was mixed.