Windows Audio Issues
Windows Audio Issues
It seems the problem isn't linked to the hardware, as the same issue appears in a digital recording where the motherboard isn't present. It's likely connected to specific frequencies, with volume shifts possibly altering the perceived sound.
A faulty component on the motherboard might be causing issues with the audio output. It’s unlikely @OnlyaName will need to disassemble every part to locate the sound filter problem near the audio area. This situation demands understanding the right frequency and filter settings, as well as being comfortable with soldering and unsoldering small components. This is essentially my reason for suggesting a return, replacement, or a full upgrade instead.