Like it"s big brother the DA-1050PRO, the DA-1000PRO sports excellent features desired by both professional and home karaoke enthusiasts alike. With digital Echo, Delay, and Repeat controls, Vocal Cancel and Partner functions, the DA-1000 Pro is a powerhouse! If expandability is what you are looking for, look no further. The DA-1000PRO gives you 3 additional microphone inputs, 2 extra A/V inputs, and 3 extra video outputs, all for a price as slim as its rackspace-saving construction.Professional digital echo with separate repeat and delay controls per mic channel 3 microphone inputs w/ individual volume controls and echo on/off switches Vocal Cancel and Vocal Partner features to delete/add guide vocals on Multiplex karaoke tapes and CDs Music Master/Bass/Treble controls Mic Master/Bass/Treble controls Source/Left/Right Level output displays CD+G and DVD input/output jacks Excellent add-on for expanding karaoke systems Included mounting brackets for rack mounting Compact 1-space design saves valuable rackspace 110/220V AC toggle switch