A System Message in MIDI refers to data bytes that are not tied to a specific MIDI channel but instead convey information applicable to the entire MIDI system or device. Based on the provided reference, a particularly important type of MIDI system message is the MIDI System Real Time message, used primarily for synchronization.
Understanding MIDI System Real Time Messages
The reference states that MIDI System Real Time messages are used to synchronize all of the MIDI clock-based equipment within a system, such as sequencers and drum machines. These messages are crucial for ensuring that multiple pieces of MIDI gear that rely on a common tempo or timeline play in sync.
Key characteristics and uses of these messages, according to the reference:
- Purpose: Synchronization. They provide the timing pulse and transport control needed to keep devices like sequencers and drum machines running together.
- Target Equipment: Primarily designed for "clock-based equipment," specifically mentioning sequencers and drum machines.
- Reception by Other Devices: Most of the System Real Time messages are normally ignored by keyboard instruments and synthesizers. This means they don't typically affect the sound generation or performance aspects of these instruments but are essential for synchronizing playback engines.
Role in a MIDI Setup
In a typical MIDI setup involving synchronized devices:
- One device (often the master sequencer or drum machine) sends System Real Time messages.
- Other devices (slaves) receive these messages and adjust their playback or timing accordingly.
- This ensures that all synchronized parts start, stop, continue, and maintain the correct tempo together, creating a cohesive musical performance or production.
While the term "System Message MIDI" can broadly encompass System Common messages (like Song Select, Tune Request) and System Exclusive messages (device-specific data), the reference focuses on the crucial role of System Real Time messages in maintaining synchronization across a MIDI system's timing-dependent components.
