Its completely different hardware that gets emulated, some of which is quite old (in approximate order: Soundblaster, OPL2, Gravis Ultrasound, Ensoniq). The PC speaker is different, additional hardware (mainly for beeps).
For Windows 10 you want the most modern, which is Intel HDA audio, and additionally the PC speaker if required. ich6 and ich9 is the Intel Southbridge type that implements the Intel HDA audio. Match it to the processor you emulate.
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