IF you have the same CPU as OP, then yes, both DSDT and SSDT can be use; otherwise, just use the DSDT and generate your own SSDT.
As for audio, you could either modify the info.plist of VoodooHDA or opt to use the patched AppleHDA.
Try booting with the DSDT and see if performance is better, I'll assist you with the patched AppleHDA for El Capitan.