I learned a lot about these units in short period of time.Spent roughly $760 in lessons too.
For one thing at a time, like either intercom, or music they are great. Try doing those 2 things all at once and it will NOT work. others told me it would. Sena said it would not work, after I bought the set. To listen to music the second(or third) intercom must be "tapped off"via the jog wheel, either of the paired intercoms can bring it back on by "tapping the jog wheel again" and it will mute the music.
I actually bought 3 units,the third i used to integrate the factory radio/CB/ intercom to bluetooth. Worked, can even talk on CB via BT, just not without turning off intercom first.
I had several email trades with Sena starting here, and it actually took asking this exact same question of 3 different "techs" to get a real answer; No only one thing at a time, so I bought the 20s and it does do all simultaneously
1995GL1500 Interstate w/Champion Sidecar
1993 GL1500 I
1988 Vulcan 800A
1986 Yamaha Venture