Hopefully everyone following this thread gets notified by this post. I reached out to @AppleSupport on Twitter, and after trying to help me through some USB I/O troubleshooting, they eventually just kept telling me to reach the manufacturer or look for an updated driver.

I requested a technical contact who might know more about USB Audio support in macOS, but I haven't gotten anywhere with that yet. Unfortunately, since I can't get an answer from Apple on whether this is a bug or an expected consequence of 'Improving compatibility with certain third-party USB Audio devices', I'm going to start looking at replacing my Fast Track Pro 😠, since I use it constantly. If anyone finds a solution for this issue, please post it here. MacOS is definitely seeing the device. As Aphor said, it's showing up in the Audio MIDI Setup MIDI Studio menu.

Yst-ms35d Drivers For Macbook Pro

It's just not seeing it as an Audio Output device. Here's the last message I received from Apple Support verbatim, in case you're interested: You're best source for support with this compatibly request would be the manufacturers of that device.

We suggest reaching out to them to see if they can provide an update, or to see what support options they have available. Apple Footer. This site contains user submitted content, comments and opinions and is for informational purposes only. Apple may provide or recommend responses as a possible solution based on the information provided; every potential issue may involve several factors not detailed in the conversations captured in an electronic forum and Apple can therefore provide no guarantee as to the efficacy of any proposed solutions on the community forums. Apple disclaims any and all liability for the acts, omissions and conduct of any third parties in connection with or related to your use of the site.

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I am not surprised! You are trying to connect a very modern TV to a receiver that is very old. The modern TV has no RCA audio OUT connections.

Nor does it have a coaxil OUT socket. The RCA sockets on the back of the TV are all 'IN' connections.

The audio out is an optical and the old receiver doesn't have an IN for it! You can get an HDMI to RCA lead. This would provided the sound of the TV.

However personally I would sell the old receiver on E-Bay and buy yourself a more modern one with HDMI connections and a Dolby sound system to match. If you can't afford a new one there are plenty of good secondhand ones on E-Bay. Answered Yesterday. I think it's more likely to be a speaker settings issue. Channels are rarely individual fused these days. Generally anything strong enough to take the fuse out would kill the power to the whole unit. Speakers also tend to have protection circuits, but again these will nearly always stop all channels workings.

Most of the these multi channels systems have the ability to have speakers switched on or off, as well as adjusting the levels for them. If you read through the user manual you should find a way of activating the missing channels. If you have lost the user manual, try looking on the Yamaha website. They should have a free PDF of it. Answered Yesterday.