xolodec5 ,
Try using the terminal as root cause amixer, if it is not Android, then you have to build it on a computer with Linux, and embedded in the android handles.
If all the start, you can try the instructions below.
Instructions with linux.org.ru
1) Determine the device, if several
Enjoying the number of the device, and there is written "device 3", where instead of 3 - your number
2) Next recruit
It displays a list of all channels, their names and characteristics
3) Select the channel of interest to us, it is better to its numeric identifier, for example,
Simple mixer control 'Master', 0
then we have to
And trying to drive
amixer -c 1 set 'Master', 0100
Where 100 - is the volume
4) Profit
Taken from this
the site Post has been editedAnodev {code} - 21.04.19, 03:20