Condition: in overall good condition. Description : The Emagic MT4 is a compact USB MIDI interface that draws its power from a USB port rather than from a separate power supply. Compatible with both Mac and PC computers (providing they have USB interfaces), the MT4 is designed to work with the majority of music software, as it supports OMS and FreeMIDI in addition to its direct compatibility with Emagic's Logic series of sequencers. The unit comes complete with USB cable and software on CD‑ROM. Measuring a little over six inches wide and two and a half inches front‑to‑back, the unit has two MIDI In ports and four MIDI Outs, thus providing 64 MIDI channels. Status LEDs are provided for each port, and there are two further LEDs that signify Patch or USB operation: when a compatible MIDI music program is loaded, the MT4 automatically switches to USB mode, but when it's not being controlled by the computer, it reverts to Patch mode, allowing it to be used as a stand‑alone MIDI router. The most obvious application of the patch system is to allow a master keyboard to play one or more sound modules without going via the computer. However, Patch mode operation requires that the MIDI interface be powered up, and as it receives power only via the USB interface, this means that either the computer or an active USB hub must be switched on too. There are 32 possible routing patches that can be set up using the included Memory Manager software, and once set, the patches are retained in memory via an internal backup battery. Apparently the unit may also be programmed via Emagic's Sound Diver universal editor, though I wasn't in a position to test this. Patches may be named, and switching between patches is accomplished using MIDI program changes. As part of the setup, you must select the MIDI In port and the channel to be used for patch selection. If this is the same port as used for connecting the master keyboard, patch changes can be sent directly from the keyboard.
