I assume you have the latest OS installed. I guess you tried adjusting the internal MIDI settings on the YC to make it discoverable. Mine works with other synths but I haven't tried it using software and a computer. I typically keep a computer as far away from a synth as possible I guess it's a phobia of some type. I assume you're using the correct USB port? I thought that the USB handled MIDI over that single line so not sure why you'd also use actual MIDI cables in combination. What's the MIDI box for?

Hi David. Thanks for responding. Yes, I installed the latest OS and firmware updates. And yes, checked settings on the Mac and YC along with trying fresh installs and changing cables. The odd thing is that the YC is discovered in all my DAWs as an audio device but none as a midi device. In audio/midi setup it appears as an audio device but doesn't show up as a midi device. For myself, I've been using computers and synths for decades from back in my Atari 1040ST days. I'm that old. To me, if the YC was discovered as a midi device but I couldn't recieve or transmit midi, I'd say it was a settings problem, but that's not the case.

The midi box: Yes, midi and audio are handled over a single USB cable which makes this whole issue even more baffling. I started using a midi I/O box when I had a Motif ES controlling Mainstage and Cubase, before the days of USB midi. Thats always been a bulletproof backup solution for me in case the usb synth to computer failed as it has here.

Hi, just guessing as I don't have a YC. Page 29 of OM.

3. Set this instrument to send and receive MIDI
data through the USB [TO HOST] terminal.
Set the value under the [MENU] button → “General”
→ “MIDI Settings” → “MIDI Port” → “USB” to “On.”

From original post...

for my system (Mojave)

The stated version of the OS is Mojave (10.14). After Mojave came Catalina (10.15), Big Sur (11), Monterey (12), and latest is Ventura (13).

The latest USB driver (Yamaha Steinberg USB Driver 3.1.4) doesn't support Mojave, so an older driver would be neded.

According to https://o.steinberg.net/en/support/downloads_hardware/yamaha_steinberg_usb_driver.html the latest driver that supports Mojave (10.14) is version 2.1.4.

Version 2.0.3 is the first version to support the YC61 - so 2.1.4 should be fine. I do not know which version was actually installed.

There's an implied gentle nudge to provide the driver version you are attempting to use.

From original post...

made sure the YC had USB as its midi port turned on

I'm guessing this means that setting the interface to USB on YC was already done.

Chris and Jason, thanks for your comments. Yes, I checked the settings in the YC and yes, the correct drivers have been installed. The drivers you linked to Jason are for Stienberg midi hardware devices. Yamaha has different drivers for their hardware keys such as the YC. Either way, the correct drivers were installed. I tested the YC with it being plugged directly into the Mac and no other midi peripherals that might cause a conflict. I should have mentioned at the start that the YC is being discovered by the Mac as an audio device but not as a midi device in Audio/Midi utility. What this tells me is that it's probably not a setting issue since the driver is telling the Mac that the YC is not even available as a midi device whether I use it that way or not. I have tried and tested it as an audio device using midi files since without being able to transmit midi from the YC I can't play a virtual instrument.

I know the equipment list shows just audio interfaces and the like, but ...

They are actually all the same drivers with two different points of distribution. Sometimes the Steinberg site will release a new version and the synth side will not put the new version up for months.

Not that any of this matters. I'm guessing you have the right version installed or at least have the information to determine this on your own.

If you look at the driver release notes/installation instructions there are some steps to give the drivers certain security rights. If that doesn't take then some things may not work right.

I get what you're saying - the Audio MIDI Setup utility when you pick "Show MIDI Studio" (or however this is done in Mojave) - YC isn't shown under MIDI Studio. This seems like a missed landing (airplane metaphor) of the driver because YC should show up no matter if it's connected or not.

I should have mentioned at the start that the YC is being discovered by the Mac as an audio device but not as a midi device in Audio/Midi utility

Just shootin' in the dark but this video is Blake talking about YC DAW integration using Cubase
https://www.youtube.com/watch?v=y-bJfFWCZ0Q

He first talks about the audio i/o interface but then about 5 min. in he selects 'MIDI Port Setup' and his screen shows the YC ports that are detected.

Is this the part you say is missing and not available in the DAW?

Hi Andrew -
The video assumes both audio and midi are working properly. It's more about how the DAW sees the available midi ports in the YC and making sure the settings in the YC are correct. What I'm saying is that the Mac itself, apart from any DAW or settings in the keyboard, doesn't recognize the YC as an available midi device in the Audio/Midi utility. If that doesnt happen first then no settings will matter.

To Jason. Yes I made sure I followed the installation steps in the driver release notes.

Take a look at the apple menu, then "About this Mac"

However you get to this screen:

Then click on "System Report"

Under USB (with the device plugged in) look for the YC61 device in the device tree. That's another area to check to see if the keyboard is "talking" with your Mac.

If the device just doesn't show up here (with or without driver - it should show up either way but possibly be identified differently) then there's a USB issue. Keyboard settings, cables. The normal stuff you've already checked. I won't lean too heavily into this but can say that others have tried multiple cables before only to find when nudged to try yet one more USB 2.0 cable (type A to type B plugged into USB TO HOST port) that things started working.

Hang in there.

EDIT: BTW - I did see where you mention audio is working -- so of course I would imagine that plugging the USB cable in/out would show something up in the USB tree.

Hey Jason how the heck did you post a photo and in the center of the screen? I've tried about a million times and nothing has ever worked even doing as they require. This system is horrible and too picky about posting common photos that we post everywhere all day long elsewhere on any other media site. It's so bad it's silly. A photo or illustration is worth a million words and is so much easier to communicate with however they make it as impossible as can be. Once I tried every file size and shape and format as they noted gif,jpg,png,zip,rar and none of them worked.

Use the 'picture' icon at the top of the reply window. You need to provide a link to the picture.

If you right-click and view the page source you can see what was provided:
'[-i-m-g] [/i-m-g-]'

Those are really 'img' - I added the dashes to make that url invalid so the url would display instead of the picture.

Try it yourself. Click on the link above and you will see the picture.

My standard is normally to:

1) Create graphic on local machine
2) Upload to image hosting (imgbb.com is what I use these days)
3) After upload, I copy the link provided by imgbb then navigate to it ("go" in the browser) then I right click on the image and pick "copy image address" so the browser now has a link that's just the picture itself and not a webpage
4) Type [img], then paste the link then Type [/img]

The image in this link happened to be already on a website tutorial I just right clicked to get the image link (clean link with just image file) and pasted that instead of having to upload to imgbb.