The Roland MD-BT01 can be connected to the MIDI interface of your instrument. The MIDI ports supply the power for the adaptor. Its sufficient to connect it to the MIDI Out for instance of a master keyboard. When the hardware is connected and paired properly you simply have to select the Bluetooth MIDI Adaptor as MIDI port in the settings of the app. The data connection is established immediately. You can use it with every app that supports Bluetooth MIDI.
Yamaha Recording-and-Computers 1GNE
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Yamaha MD-BT01 Bluetooth MIDI Adaptor