=> R0 = 0 receive messages normally (default)
= 1 ignore recieved timing messages
Instructs the system to ignore or take notice of received tiing messages.
There is a subtle distinction between the mode set by this SWI, where received Timing messages are completely ignored, and the mode set by calling MIDI_Init with bit 31 set, which only disables special actions on Timing Message reception. The messages may still be stored in the receive buffer in the latter case, if MIDI_Init is called with bit 30 set, but not if Ignore Timing mode is set.
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