I plug a bluetooth receiver ($8.00) into the saddlebag USB. I put my Iphone in the left front cubbyhole with Pandora playing on the phone thru bluetooth. Using the AUX setting on the radio I can use the handlebar volume and skip switches on the handlebars.
Here is the USB Bluetooth Receiver that I use.
Mine is a hbit pricy,
I use a sena 20s and a Sena sm 10 bluetooth trasmitter.
The sena sm10 has my headset jack and GPS plugged into it.
This allows me to hear music annd the GPS cuts out music and gives directions.
Also can make and receive phone calls.