Included in the Audio File Player is a MIDI metronome optimized for working with short loops. Tell the MIDI metronome the musical length of a loop and it will generate MIDI notes for a metronome. The MIDI metronome does not do tempo detection and is unrelated to the audio metronome.
The MIDI metronome plays when the master audio file starts playing. MIDI channel and note settings for the metronome are accessed in the Audio File Player by clicking the metronome on/off button. Naturally, the MIDI Out from this plugin needs to drive MIDI In on a MIDI sound source plugin.
For more detail on the MIDI metronome, see the Audio File Player section.