Could we have simply turned the Zumo volume down??

I wonder if my friends and I could have simply turned the volume down to ZERO on my Zumo 665's to keep them from blocking intercom operation.   

With the Zumo paired as A2DP first phone (to listen to XM, MP3, or Audio Books; every driving direction, alert, "recalculating", etc by the zumo interrupted intercom.  Sometimes, the 20S intercom would not come back for hours.  

Would have "muting" navigation on the Zumo have stopped it from taking top 20S priority and muting intercom?  

Does muting the Zumo navigation also stop the button-pressing beeps and alert beeps?  



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