The MPX 1 multi-effects processor does what its description implies. When using the best reverb on most single DSP multi-effect processors, additional DSP is simply not available for any other effects. With the MPX 1 Lexicon provides both their own proprietary Lexichip, dedicated to delivering the best Lexicon stereo reverb or ambience, in addition to another processor which can host other digital effects, as many as 4 stereo effects.
Six effect types are accessible in the MPX 1 at all times via dedicated, backlit buttons on the front panel. Each effect "block" is totally independent, with its own mix, level and bypass controls. The audio path through each effect is in stereo. Each block is capable of multiple, related effects. For instance, the chorus block can generate flanger, phaser, rotary cabinet, aerosol, centrifuge, orbits, and comb effects, in addition to chorus.
To complement the effects themselves, Lexicon has included a very comprehensive modulation section, including two LFO's, two attack/release envelope generators, a sample and hold generator, a random number generator and input level as a modulation source. Dynamic MIDI patching and MIDI automation, along with an "intelligent sorting" feature, balance analog inputs and outputs, digital inputs and outputs, make the MPX 1 a very attractive effects processor at its particular price point.