Would something similar to this work with Realtek drivers, perhaps even without the percentage...
SetDigitalHeadphoneBass35% = 1
SetDigitalHeadphoneTreble35% =
SetDigitalFrontLeftSpeakerBass75% = 1
SetDigitalFrontRightSpeakerBass75% = 1
SetDigitalCenterSpeakerBass75% = 1
SetDigitalSideSpeakerBass75% = 1
SetDigitalRearSpeakerBass75% = 1
SetDigitalRearCenterSpeakerBass75% = 1
SetDigitalLeftSpeakerTreble70% = 1
SetDigitalFrontSpeakerTreble70% = 1
SetDigitalCenterSpeakerTreble70% = 1
SetDigitalFrontSpeakerTreble70% = 1
SetDigitalSideSpeakerTreble70% = 1
SetDigitalRearSpeakerTreble70% = 1
SetDigitalRearCenterTreble70% = 1
SetDigitalBass65% = 1
SetDigitalSubWooferBass40% = 1
SetDigitalTreble62% = 1
SetDigitalDolby100% = 1
SetDigitalOut100% = 1
SetDigitalOpticalOutBass65% =
SetDigitalOpticalOutTreble62% = 1
SetDigitalOpticalInBass65% =
SetDigitalOpticalInTreble62% = 1
SetDigitalVoiceFilter = 1
SetDigitalNoStaticInput = 1
SetDigitalNoStaticOutput = 1
SetDigitalHeadphoneBass35% = 1
SetDigitalHeadphoneTreble35% =
SetDigitalFrontLeftSpeakerBass75% = 1
SetDigitalFrontRightSpeakerBass75% = 1
SetDigitalCenterSpeakerBass75% = 1
SetDigitalSideSpeakerBass75% = 1
SetDigitalRearSpeakerBass75% = 1
SetDigitalRearCenterSpeakerBass75% = 1
SetDigitalLeftSpeakerTreble70% = 1
SetDigitalFrontSpeakerTreble70% = 1
SetDigitalCenterSpeakerTreble70% = 1
SetDigitalFrontSpeakerTreble70% = 1
SetDigitalSideSpeakerTreble70% = 1
SetDigitalRearSpeakerTreble70% = 1
SetDigitalRearCenterTreble70% = 1
SetDigitalBass65% = 1
SetDigitalSubWooferBass40% = 1
SetDigitalTreble62% = 1
SetDigitalDolby100% = 1
SetDigitalOut100% = 1
SetDigitalOpticalOutBass65% =
SetDigitalOpticalOutTreble62% = 1
SetDigitalOpticalInBass65% =
SetDigitalOpticalInTreble62% = 1
SetDigitalVoiceFilter = 1
SetDigitalNoStaticInput = 1
SetDigitalNoStaticOutput = 1