A data frame consisting of columns
timeTime or delta-time of the events, depending on the MIDI format.
eventA factor indicating the event.
typeAn integer indicating the type of a “meta event”, otherwise NA
.
channelThe channel number or NA
if not applicable.
parameter1First parameter of an event, e.g. a representation for a note in a “note event”.
parameter2Second parameter of an event.
parameterMetaSystemInformation in a “meta event”, currently all meta events are converted to a character representation (of hex, if all fails), but future versions may have more appropriate representations.
trackThe track number.
Please see the given reference about the MIDI file format about details.