<P> MIDI beat clock (also known as MIDI timing clock or simply MIDI clock) is a clock signal that is broadcast via MIDI to ensure that several MIDI - enabled devices such as a synthesizer or music sequencer stay in synchronization . It is not MIDI timecode . </P> <P> Unlike MIDI timecode, the MIDI beat clock is tempo - dependent . Clock events are sent at a rate of 24 ppqn (pulses per quarter note). Those pulses are used to maintain a synchronized tempo for synthesizers that have BPM - dependent voices and also for arpeggiator synchronization . Location information can be specified using MIDI Song Position Pointer (SPP, see below), although many simple MIDI devices ignore this message . </P> <P> Because of limitations in MIDI and synthesizers, devices driven by MIDI beatclock are often subject to clock drift . </P>

What is the rate of midi clock in ppqn