I use the squeezelite player on Orange PI ZERO (Armbian).

How to set a fixed power-on volume level on Orange PI ZERO?

Tried options:
1 Plugin ResetVolume. Helps only when you turn off the button in the program.

2 Plugin VolumeLock. Blocks volume change altogether.

So far I found this way out:
added the line
25 22 * * * curl "http://192.168.1.177:9000/status.htm?p0=mixer&p1=volume&p2=10&player=Kitchen "&
to the crontab file.

Those. before turning off the power at 22:25, the player sets the volume to 10 units.

But this is not very convenient ...