20–400 BPM, any time signature, five accent levels, subdivisions, swing, count-in, speed and gap trainers.
A metronome can become a crutch: you follow the click instead of feeling the beat yourself. A gap click fixes that. It plays for a few bars, goes silent for a few, then comes back, and you find out at once whether you were still on time.
The metronome above clicks for 2 bars and stays silent for 2 at 80 BPM. Keep playing through the silence. When the click returns it should land exactly with you. As you improve, make the silent stretch longer, or add random silent beats in Advanced.
If you rush or drag in the gaps, slow the tempo down before making the gaps longer.
If the click comes back after you, you sped up (rushed) in the silence; if it comes back before you, you slowed down (dragged). Most players rush when they are excited and drag on hard passages. Notice which you do, and count the beats out loud through the gaps until you land with the click every time.
A metronome that drops out for some bars, so you have to keep time on your own and check yourself when it returns.
Start with as many silent bars as clicking ones, and double the silence as your timing gets steadier.