Interval training: how to increase beep and vibration levels?

Today I did an interval run training (time based) with my Instinct Solar for the first time.

When I used to do these with my previous watch, a Forerunner 45, it would give three clearly audible beeps when a new interval started, and it would also give a clear beep and vibration alert when an interval ended.

On my Instinct Solar, I didn't hear any beeps when the intervals started and ended, and the vibration was hard to detect. Is there a way to enable those beeps, and/or make them louder? And is the vibration level adjustable?

I must add that it was bad weather, so my watch was covered by a wind jacket. But that same jacket never was a problem with the Forerunner 45.