Question Which is better for controlling volume

So simple question. Not trying to do anything too fancy I'm curious
I have this equation.
volume = (masterVolume * maxVolumeForAudioSource) / 1f;

So lets say I have a master volume slider and a slider for music the equation would be
volume = (masterVolume * musicVolume) / 1f;

if I then introduced a sfx slider that equation to utilize that would be
volume = (masterVolume * sfxVolume) / 1f;

right. and then I'd assign the audio source volume to that volume value right.
audioSource.volume = volume

But what about audio mixers? What if introduced those into the equation? Would that be overkill for simply adjusting volume? Which would be better for somebody who's never used AudioMixers?