Laps/workout steps - Vibration only alerts

I haven't been able to find this in the manual - I'm probably just overlooking something...

When doing workouts and such, my watch beeps and vibrates when I finish an interval/lap etc.
I would prefer it vibrate only, instead of having it audibly beep. When I turned off alerts in settings, it turned off both beeps and vibrations.

Any way to turn off beeps but keep vibration alerts on?