Looking at the 3-other controls, we have the "Source" button that lets you chose between the Zune, Auxiliary input and FM Radio.  The last two buttons allow you to fast forward on a song or if you hold them longer they will change tracks for you on your Zune player while it is docked.

Here you can see the remote control that is provided with the iM414, the top two buttons are the "Power Button" and the "Source" buttons.  You can see the three "P" buttons and as you have more than likely figured out these are for programming presets on the FM radio.

The last two buttons on the right column are the "Bass Boost" and "Surround Sound" buttons.  The remote completes the package and makes this device a must have for a Zune user.

Looking at the rear of the iM414 you have four things of interest on this side of the unit.  Located on the lower portion of the unit you can see two opening that lead to the inside of the case.  What these are are bass reflective ports that allow the thumping of the bass to escape from the enclosure so as not to distort the music that is being directed out the front of the unit.