it's not there
ESI M4U XL 4 in/ 4 out (64 MIDI-channels) USB 2.0 MIDI-Interface, activity indicators for each port, perfect MIDI-Timing, USB-Bus powered (no PSU neccessary), support true plug and play installation requires no device-driver, IRQ, I/O Adress or DMA channel setup), compact 1/3 racksize, for Windows XP, Vista or Mac OS X only
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