Volume
I had a similar problem when I first connected my Cardo Scala Rider set to the helmet. First off, make sure that the volume on the Zumo is set to 100% for BOTH guidance and mp3 functions. Then click the upper control on the Cado Scala to maximize the volume of the headset. When you've accomplished those two electronic hurdles, adjust the location of the speakers in the helmet - if location of the speakers is not optimized nothing you do with the electronics will have much effect. I typically run the mp3 volume at 20% and the GPS at 50% with the headset volume at halfway. My Cardo Scala unit is a Teamset and I sometimes have problems hearing my rider scream that I'm going too fast. I haven't bothered yet to tell her to keep the microphone closer to her lips.
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