store adjustment values (volume, HPF, LPF and DCR) while power is OFF/on or reboot

[Jjmphiphi]

Hi. Would like to keep above mentioned values when reboot or power switch on and on.
tried various ways without success . Did someone found the way?

[easytarget]

I have not done this myself, but you need to be keeping the values in nonvolatile memory and reapply them after booting.

This means using either eeprom, or creating a filesystem (littleFS) and storing the values in that (as a JSON string). Look for online tutorial on 'esp32 nonvolatile storage'