The Dual Deltafex is like having two multi-effects units in one. Providing powerful digital signal processing with flexible dual audio connections in a single rack space makes this unit perfect for studio or live applications. Dual inputs and outputs allow for four operational modes; Series, Parallel, Dual Mono and Sum Mono. Both Series and Parallel modes process a stereo input signal into a stereo output signal. Dual Mono mode configures the unit exactly like two separate stereo effects processors. Sum Mono works the same as Dual Mono, except it combines the two effects units into one pair of outputs. Featuring 16 programmable effects including multiple reverbs and delays, compressor, pitch shifter, chorus, flanger, phaser, tremolo, rotary speaker, distortion, exciter and karaoke (vocal eliminator), the Dual Deltafex is truly two units in one. You'll save money and space with the Dual Deltafex.