Definitions for "PPQN"
Keywords:  midi, quarter, synth, ticks, obsolete
parts per quarter note. A time format used for Musical Instrument Digital Interface (MIDI) sequences. PPQN is the most common time format used with standard MIDI files.
See parts per quarter note.
Pulses per Quarter-Note. Similar in timing to Ticks per Quarter-Note, but this term is normally used when referring to standard analog synth clock signals. It is also an obsolete type of synchronization. It served the same purpose as the MIDI Timing Clock message.