Thanks for that hint. If I put my ear directly on the watch with Bangle.beep(200, 3000); there really is a tiny beep, but the alert function if set to "beep on" and "vibration off" is not even using this one. As you already mentioned the "sound" of this beep sometimes is some sort of rumbling, but in general it is no bad idea to use the vibrator for sound too.
Looks like I do have the same problem with the Bangle.js 2 I ordered in February this year (2022). No way to get a sound out of it, but vibration is Ok.
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Thanks for that hint. If I put my ear directly on the watch with
Bangle.beep(200, 3000);
there really is a tiny beep, but the alert function if set to "beep on" and "vibration off" is not even using this one. As you already mentioned the "sound" of this beep sometimes is some sort of rumbling, but in general it is no bad idea to use the vibrator for sound too.