Does the Yamaha keyboard have regular MIDI Din connectors or only a USB connector? (Hence the need for a USB host.)
If not, then do you have any other MIDI equipment that you can connect directly to the Sound Canvas to test connectivity?

Thanks Eddie,

Thae Yamaha keyboard only has USB midi, thus the need for the USB host. The SC-88 works fine when connecting to a PC and running Finale.

Gary.

[quotePost id=13904]The SC-88 works fine when connecting to a PC and running Finale. [/quotePost]
By this do you mean that Finale can accept input from your Yamaha keyboard and successfully route it to the SC-88?
If not, it would be worth getting that working first. That will confirm that MIDI data is being properly received from the keyboard and is being properly sent to the SC-88.
Once you have that confirmation, it will be necessary to troubleshoot why the Miditech device cannot do what your PC is doing.

After looking over the Yamaha P-125 manuals (especially the "Computer-related Operations" document), it looks like the Yamaha P-125 uses its USB TO HOST port for 2 or 3 simultaneous functions:

1. USB MIDI device
2. USB audio device
3. USB proprietary device(?) for song file transfers

When you connect the Yamaha P-125 to a computer, it will probably appear as a USB hub with 2 or 3 USB devices attached to it.

In the first review on this page (the review by Koshdukai on 07.08.2021), the reviewer describes their Miditech USB MIDI Host worked with their Teenage Engineering OP-1 until a recent firmware update which upgraded that device to have both USB MIDI and USB audio functions. (That review also says if you attempt to use the Miditech USB MIDI Host with a device that sends MIDI Clock messages, it will hang after a few seconds. The Yamaha P-125 MIDI Reference document says it sends MIDI Clock messages.)

It looks like USB MIDI Host devices may often have issues with MIDI devices that act as USB hubs. When I looked at some other USB MIDI Host devices, some of them specifically say they have issues with devices that act as USB hubs, while others specifically mention they are compatible with devices that act as USB hubs:

• The Kenton MIDI USB Host describes devices with a built-in USB hub will only work with its later firmware versions.
• The DOREMiDi MIDI USB Host doesn't specifically describe compatibility with devices that act as USB hub, but its compatibility list says the Yamaha P-125 is compatible.
• The Sevilla Soft USB HOST MIDI 2 says it is compatible with devices that have an integrated hub.
• The HobbyTronics "MIDI USB to DIN Converter" says it is not compatible with devices that have a built-in USB hub.

Many thanks all for your replies.

Gary.