or you can get a metronome phone app that plays the tones via bluetooth, while listening to music via bluetooth.
shouldnt garmin at least PROVIDE THE OPTION that if you want music AND metronome, you could play them simultaneously via blue tooth.??
I mean, whats the point of providing a metronome AND MUSIC. but if you're listening to music outdoors, um . . . running, i seriously doubt you're going to hear the watch metronome tones. and who wants 180 vibrations per minute? (i'm just guessing you're not going to get the "7 days battery life" like that.
There is an app called Soundbrenner (Android) that works fine through headphones with music and has a separate volume/mixer.