In MIDI, two data bytes which follow a Universal System-Exclusive data byte in a system-exclusive message which define the type of message. A Sub ID#1 value of 1 indicates MTC and bay be followed by a Sub ID#2 value of 1 for a Full Message, or 2 (User Bits), or 15 (Set-Up). A Universal non-real-time Sub ID#1 value of 5, on the other hand, indicates a sample dump and may be followed by a Sub ID#2 value of 1 for a Multiple Loop Points message or 2 for a Loop Points Request.