Sure
I break it into two pieces, MUSIC and BT.
MUSIC
Unit comes with a 12 inch cable that plugs into the CD changer slot on the radio.
I put the unit in the cubby to have access to the USB/AUX/iPod sockets.
It takes the place of the CD and is activated by pushing the CD button on the radio.
There's a method of rotating through the USB/AUX/Ipod use by pressing the AM/FM button, waiting a second, and pressing the CD button. A voice will say which is active and pressing the Seek button will move to the next choice.
When using the USB stick, you place your music in 6 folders being mindful of the correct file naming conventions they provide. Pressing the track buttons (1, 2, etc) will access the folder (1, 2, etc) and begin playing either the first song or it will remember the last song played in that folder. You can move to the next song using the SEEK button (or back up if desired). 5 clicks will move it 5 songs. Sometimes a brief delay when moving more than a couple.
No display of song title or author though, just Track 1, Song 1, etc.
Scan will work and is configurable with the default being 10.
I've also used the iPod function. You control the music via your iPod though it does mean you need to handle the iPod/iPhone. Probably could find a mount for the iPod that would make it easier to manage. I haven't done that yet.
I don't have an MP3 player, but I suspect it would work like the USB.
All-in-all a nice addition to a pretty good radio.
BT (Still a work in progress)
This intrigued me, but there have been some growing pains.
The BT dongle plugs into the iPod/iPhone slot. There have been firmware updates to activate this function.
The current firmware I'm using has made it workable. I'm adjusting the microphone gain (via the Configuration file) and it seems good.
A hitch I'm experiencing is that I need to remove the USB stick when I turn the radio on and then reinsert it so the music will play from the USB stick. Rest of the radio works just fine,
Pairing the phone was easy and it connects upon powering the radio on.
The Grom unit and the BT device and wiring fills the cubby up which makes unplugging/plugging the USB stick cumbersome. I plan on installing the microphone in the light panel between the sunvisors and moving the Grom device and BT dongle behind the cubby (lots of room there). I am sourcing panel mount cables to go from the Grom device to the cubby which should make the USB problem much easier.
Pretty inexpensive BT option. Just need to work through a few issues.
HTH Skippy