And hey, only the most insufferably compulsive MIDI literalist yours truly is so enamored of, let alone aware of, the minute details of the MIDI Spec that they would actually take time to parse out the differences between the separate MIDI system messages, right? In summary, when you press play in your Beat Clock enabled DAW, it sends out the messages required to ensure that slave devices not only start, but that they start from the desired position and all play at the same speed.
Addendum: To illustrate the above argument, I have included some screen captures that display messages generated by several computer based music production tools. Song Position Pointer 0 0 , Continue, and Stop messages are sent when transport commands are initiated, but act independently of the Beat Clock message transmission.
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For true sync, what two answers should you answer? When speed or timing and where location or position. Is MIDI beat clock relative or absolute? Is MIDI time code relative or absolute? What type of sync do drum machines typically use? MIDI beat clock. What type of sync do tape machines generally use? What is the only form of digital time code? Which digital audio protocol uses up to 8 audio channels? It should be noted that all set ups are not suitable for more than 1 slave device. It is sent in quarter frame intervals as MIDI system exclusive data.
MIDI clock sync was originally used to tell devices when to start, stop, continue and match the tempo of the master device. This is perfect for making synths and samplers synchronize effects, LFOs, and delay time. MIDI clock also passes tempo information which is important when synchronizing time based sound sources such as arpeggiators and drum loops. SPP is based on bars, beats, and subdivisions of beats down to "ticks" also called clocks. For some devices that is all you need and you don't have to use MTC, which is based on hours, minutes, seconds, frames and quarter frames.
If the multi-track is the MMC master, when you press "play" on the multitrack, the sequencer will start. If you make the sequencer the MMC master, pressing "play" will start the multi-track. MMC only triggers the transport controls and sends a locate point information.
No timing information is transmitted. Commands are effectively "Go to", "start", "stop", "rewind", "fast forward". The sync features available on any device are pretty varied, and the implementations on specific machines can also vary in adherence to the MIDI standard on early devices.
All this means that you will likely have to experiment with the exact MIDI sync set up that will work for you. Some can be a MMC master but not a slave. Usually, there is one combination that will work, but don't bank on it.
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