If the + key worked, it means that AAC audio was decoded by PMP and then sent to the amp as PCM.
Whereas all streams in other formats were sent as they were (bitstreamed) and it was then up to the amp to decode them.
If the + key worked, it means that AAC audio was decoded by PMP and then sent to the amp as PCM.
Whereas all streams in other formats were sent as they were (bitstreamed) and it was then up to the amp to decode them.