For our playback tests, we used almost all possible formats of MP3, MP3Pro and WMA files. The AB320 didn't have any problem recognising all the tested files and playing them back perfectly. That's a big plus for the device. The device can show ID3 tags (rotating) or the filename (if ID3 tag doesn't exist). By pressing the > < buttons, the user can skip to the next or previous track, while the current folder is also displayed. Here we met with a small problem, there being no way to jump directly from one folder to another, having instead to traverse all files before proceeding to the next folder. A workaround is to enter the device menu, select the desired folder (from the folder menu) and press the "Play/Pause" button. The AB320 can also display lyrics if present, from *.lrc/ Lyric3/ Lyric3 V1.1 files. Lastly, the device has an A-B repeat function, where you can mark the beginning and end of a portion of a track which is then repeated.

The device can also be used as a recording device (either using the MIC or from the FM radio). In both cases, the saved files produced are .WAV files. The FM radio function can be accessed directly by pressing the AB/FM button. By pressing the AB/FM button for 3 seconds, the device will auto search for and then save 20 stations as presets. Of course, you can search manually for your favorite stations. Notice that the device doesn't display RDS information...