Probably the easiest way to turn the volume up is to run the alsamixer command and press the up arrow cursor until the screen looks like this:
alsamixer on a Raspberry Pi

Press the Escape key to exit. You then need to store that configuration so that it is the default when the machine is turned on:

$ sudo alsactl store

Es gibt einen HAT für den OrangePi

https://www.tindie.com/products/sonocotta/orange-pi-hi-fi-hat/#specs