The drumKAT 3.5 has two pairs of MIDI OUT jacks. This allows you to actually perform 32 Channel MIDI if you want. Or you can map these two pairs of MIDI outputs to be four identical MIDI OUTs. These options allow you to choose how you would like to set up your equipment. The MIDI OUT can contain a merge of selected drumKAT 3.5 information as well as selected MIDI IN information from either (or both) of the two MIDI INs .