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The Metronome is a utility app that produces audible click tracks at a configurable tempo and rhythm. It is useful for musicians practicing with the PortaPack's speaker or headphone output.

This is an External-apps-informations (.ppma file on the SD card).

Controls

Field	Range	Description
BPM	1 – 1000	Beats per minute (tempo). Default: 120.
Tap Tempo	—	Opens the Tap Tempo screen to set BPM by tapping.
Accent Beep Tune	380 – 24000 Hz	Frequency of the accented beat (first beat of each bar). Default: 880 Hz.
Unaccent Beep Tune	380 – 24000 Hz	Frequency of all other beats. Default: 440 Hz.
Rhythm	1–99 / 1–99	Time signature as beats per bar / note value (e.g. 4/4, 3/4, 6/8).
Beep Flash Duration	10 – 999 ms	How long each beep lasts. Default: 100 ms.
Volume	0 – 99	Audio output volume.
Play / Stop	—	Large button at the bottom. Starts or stops the metronome.

Progress Bar

The progress bar shows the current beat position within the bar:

• 🔴 Red — accented beat (first beat of the bar)
• 🟢 Green — unaccented beats

Tap Tempo Screen

Pressing Tap Tempo opens a sub-screen where you can:

• Tap BPM — tap the large button repeatedly in rhythm; the app averages the last 4 taps to calculate the BPM.
• Input BPM — type a BPM value directly via the keyboard.
• Apply — confirm and return to the main screen.
• Cancel — discard changes and restore the previous BPM.

Notes

• The metronome uses the PortaPack's audio output — connect headphones via the 3.5 mm jack or use the internal speaker.
• The accent beat is always the first beat of each bar; all other beats are unaccented.
• The Rhythm field follows standard music notation: the left number is beats per bar, the right number is the note value that counts as one beat (e.g. 6/8 plays six eighth-note beats per bar).