User Manual

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About the “Running Status on DIN ports” checkbox (under MIDI
Information): this defaults to being disabled/not transmitted (white),
since it must be implemented – and implemented correctly - in the
receiving device to function. As a practical matter, Running Status is
a “leave it off unless you know otherwise” parameter.
Running Status is part of the MIDI spec, implemented to reduce the
amount of MIDI data that must be sent. It works by assuming that the
first part of the message—the Status byte, for example Note On—is
the same as in the previous message, therefore only the Data bytes
need to be sent. With Running Status disabled, the Status byte is
followed by the Data bytes as normal, e.g. “This is a note [Status]; it’s
a C3 at velocity 105, etc. etc. [Data]; with Running Status enabled,
only the first Note-on needs to be sent, and you don't need another
Status byte until you send a different kind of MIDI command - for
example if you step on or lift the sustain pedal.
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