Acura 2011 RL Owner's Manual page 264

Audio System
Depending on the software the
files were made with, it may not be
possible to play some files, or
display some text data.
Depending on the type of
encoding and writing software
used, there may be cases where
character information does not
display properly.
The order of files in USB playback
may be different from the order of
files displayed in PC or other
devices etc. Files are played in the
order stored in USB flash memory
device.
Some devices cannot be powered
or charged via the USB adapter. If
this is the case, use the accessory
adapter to supply power to your
device.
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Some versions of MP3, WMA, or
AAC format may not be supported. If
an unsupported file is found, the
audio unit displays UNSUPPORTED,
then skips to the next file.
In WMA or AAC format, DRM
(digital rights management) files
cannot be played. If the system finds
a DRM file, the audio unit displays
UNPLAYABLE FILE, and then skips
to the next file.
Combining a low sampling f requency
with a low bitrate may result in
extremely degraded sound quality.
Voice Control System
You can select the AUX mode by
using the navigation system voice
control buttons, but cannot operate
the play mode functions.