My Aerophone does show up as a USB target on my MIDI hub (mioXM), so maybe you're right about the host karma. Later, I'll try putting the Sylphyo Link's MIDI DIN on the MIDI hub, too, and see how well I can control the Aerophone that way. I'm concerned about latency with this config, though.

OK, thanks for verifying that, theoretically, I'm set up correctly. I'll start checking on things from the Aerophone's side to verify if it can be controlled from other sources.

My Roland Aerophone AE-10 has a USB-B port, which the documentation says you use "to connect this port to your computer. It can be used to transfer USB MIDI data." You can set the transmit channel, but it receives on all MIDI channels.

I connect the Aerophone's USB-B to my Sylphyo Link's MIDI host port, but when I play the Sylphyo, the Aerophone doesn't respond. Am I misunderstanding something?