3) During combination playback, it is allowed to Play/Pause and set volume, but not allowed to set previous
and next. If need stop, just direct send the Stop command. And it is not allowed to play another group of
combination during it is working. Users need to send the stop command to stop the current combination
playback before start another group of combination playback.
4) If a track specified to be played in combination is not in the folder, it will stop playing at this track position,
so please make sure the track specified to play must be available in the folder.
5) If users are very strict to the combination playback, please edit the sound sources with some audio edit
software like Adobe Audition or GoldWave to cut off the silence at the beginning and end of the sound file.
4.5.14 Specify playback of a track with a specific volume level (under the root directory)
1) This function is added to meet some users‟ needs to play a track at a specific volume level wi th one
command only, but this only can be executed for the tracks under the root directory of the storage device.
The command is 0x22.
2) For normal operations, users still need to send the volume command first and then specify playback of a
track with the corresponding command like most of MP3 players.
4.6. Detailed Annotation of Query Commands
4.6.1 Query current online storage device
Query current online storage device 7E FF 06 3F 00 00 00 FE BC EF
When the module is working, users can use the command as above (0x3F) to query the status of the online storage devices. For
example, if the module returns the data 7E FF 06 3F 00 00 0A xx xx EF, LSB 0x0A (0000 1010) represents SD card online. If LSB
is 0x1F (0000 1111), it represents all of USB flash, SD card and PC online (PC online means module is connecting with PC via a
USB cable).
4.6.2 Query current status
Query current online storage device 7E FF 06 42 00 00 00 FE B9 EF
1) There are 4 status (playing, paused playing, stopped playing and in sleep) that can be queried during the
module is decoding. Users can query the current status via sending the command as above (0 x42).
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