You cannot run Mutibeast properly until SIP is completely disabled, not partially disabled (as may be set by running Multibeast) especially audio Kexts.
It is very important that you fully understand SIP.
You need to verify SIP is disabled or partially disabled with terminal before adding third party kexts.
4. If your system has CFG-Lock, disable it
5. If your system has Secure Boot Mode, disable it
7. If your system has IO SerialPort, disable it
8. Set XHCI Handoff to Enabled
These are bios settings, enabled and disabled, before booting. IE no Clover, no OS involved. Download a Motherboard manual and find out where these setting live in the Bios and how to adjust them and what keyboard command allow bios access. If and OEM product then you should not even being attempting to install Sierra not knowing what a bios is, and how to configure it. Laptops and OEM computers do not have full access to the bios, to clarify; the have what is known as a "dummied down bios" and most of the advanced user configurations and overclocking settings, have been removed and are unavailable for access to the normal user. Most of 4,5,7 and 8 are on all machines. 7 and 8 are often time disabled or not present.