This is the driving method of 'A-49' by the m... This is the driving method of 'A-49' by the mobile battery. Connect a USB cable of the mobile battery to 'A-49' as pressing the [FUNCTION] button and the [PITCH] button and the [ASSIGN] button. But, this is an unofficial method of the maker 'Roland', so I do not take responsibility. #RolandAmbassador #ローランドアンバサダー Yoshihiro KUMAKIRIさん(@yoshihiro_kumakiri_1969)がシェアした投稿 - 2018年Aug月21日am6時28分PDT