Volume is not adjustable USB DAC

[enik174]

There is a DAC - DAC Sa9023 ES9023 HiFi (in the neutron it is defined as bravo-x usb audio (savitech))
Neutron version arm v7 + neon
Radio tape recorder on android - MTK8227L

The fact is that I just can't adjust the volume control through the neutron by means of the radio tape recorder. Although through uapp, the volume is regulated by a standard (radio) rotary and buttons on the steering wheel.
Question! How to do the same in a neutron? Neutron suits everyone, but this minus is just huge! On the road, in order to change the volume, you have to call the slider in the program.

I bought the program through the play market. But I can't fully use it. Help me please.

[blaubär]

Did you try out "Settings > Audio Hardware > Direct USB Access", and therein "Volume Control" ?
On which device is Neutron installed - on the radio tape recorder ? And how is the DAC attached to that ?

[enik174]

The usb DAC is connected to the radio tape recorder via usb, and then it goes to the amplifier. All settings are enabled but not working.

[enik174]

pictures

[blaubär]

So Neutron is installed on you car stereo, this is connected via USB to an amplifier, and you'd like to control the volume via the car stereo's volume knob. Feel free to ask neutronmp@gmail.com how to do this.

[dmitrykos]

Hi! Normally volume control must be available because Neutron is getting volume change commands from the OS:

Car HUD -> OS -> Volume Control even (+/-) -> Neutron adjusts volume

May be something is blocking Volume control events in the system and they are not propagated to Neutron's process.