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Connect everything with one USB cable. Since the power is supplied from the computer, no AC adaptor is needed. The same USB connection provides MIDI IN and OUT ports that allow the keyboard to function as a MIDI interface to other external MIDI devices. It addition to this, all the information from keys and controllers can be sent through the MIDI OUT port so that you can control both software and external MIDI devices at the same time (MIDI Interface mode = OFF). With the interface mode turned on, the PCR-M80/M50/M30 can control multiple applications at the same time. Control your DAW (Digital Audio Workstation) and software synthesizer at the same time. The MIDI processing in the PCRM80/ M50/M30 is compatible with FPT (Fast Processing Technology). This technology doesn't depend on music application you are using. It provides stable, high speed, low latency, and low jitter MIDI transmission.