Stop music with command

Thank you for the great feature - to play mp3 with wm_sfx conmand. Could you please add command to stop playing music?
It is very useful for choosing melody for the alarm, for example.
Onnthe real watch (casio, maybe) you could press button - music starts playing, second press will interrupt playing current melody and next melody starts playing etc).
But with watchmaker next press will start playing of next (or current) melody in parallel. So, you need to wait until current melody will finish and press button only after this.
So, command wm_stop_sfx will be very useful.

Please.