Michel Forum Home | Recent Posts New Member Joined: Nov 22, 2020 Follow Profile Activity Topics: 0 / Replies: 1 AllTopicsReplies Reply Controller 87 is also ued by Yamaha as a volume control but I really don't know what it does. I'll try to look into it. It's not documented by Yamaha ... 4 years ago Forum Developers & MIDI 2.0 Specifications