Boosting audio volume through OpenCore

[cci[RR]us]

I'd like to increase the maximum sound volume on my IdeaPad 330S-14iKB laptop built-in speaker. At maximum volume, the built-in speaker is still quite soft. It's louder in Windows.

It has OC 0.82, Monterey 12.5, and AppleALC. I read that there are 3 audio settings in OpenCore but not sure how should I set them:

Root > UEFI > Audio:

• MaximumGain (number): maximum gain to use for UEFI audio, specified in decibels (dB) with respect to amplifier reference level of 0 dB. Failsafe: -15.
  
  
• MinimumAssistGain (number): minimum gain in decibels (dB) to use for picker audio assist. The screen reader will use this amplifier gain if the system amplifier gain read from the SystemAudioVolumeDB NVRAM variable is lower than this. Failsafe: -30.
  
  
• MinimumAudibleGain (number): minimum gain in decibels (dB) at which to attempt to play any sound. Failsafe: -128. Sample.plist file has -55

I tried setting MaximumGain from -15 to -5 but it doesn't seem to increase the max audio volume. Any ideas? Thank you!