Volume is not as load as it was on AmP2

Hello guys.

I have a question, I'm having an interactive installation (https://projects.raspberrypi.org/en/projects/gpio-music-box) running on my Raspberry PI and AMP2. The question is why is the sound not as loud as it was when I have set it 65%. There might have been several resets to the whole thing, but I thought that Raspberry PI saves the settings if it comes to a reboot.

So, did anyone ever had any similar issue ? Or a possible solution, thanks. 


best regards, Jure


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