I'm a recording engineer trying to "upgrade" to either an iMac Pro or Mac Pro from a 5,1 but what happened to the optical TosLink interface? How in heaven (or hell) will I connect a newer Mac to existing pro audio hardware that uses either optical pipe 5.1 or digital RCA 5.1? USB doesn't seem to work and the new tiny usb-C mac connectors while convenient and faster, don't seem to offer adapters to TosLink. Why apple... whyyyyyyyy? Any suggestions? From a recording engineer point of view - where many older outboard gear sound way better than the new stuff - these new apple "pro" computers are frustrating when it comes to connectivity.