I recently turned on Workout alerts on an Activity Profile on my Garmin 830. I made sure to turn on Tone Alerts in System so I would receive an audible cue. I rode today in this Activity profile and the Garmin gave me visual cues when I went in and out of workout zones, but did not give me any audible alerts. Is there something else that I need to do to begin receiving audible alerts? I am on Software Version 7.10 and Garmin reports that that is the most current release. Tx