[BUG] Line 6 products (various models) work with UMP-aware tools, but not with MIDI 1 tools

[Psychlist1972]

Reddit
https://www.reddit.com/r/line6/comments/1vixssl/comment/p5rri0y/?context=1&screen_view_count=2&ext-referrer=DIRECT

Thank you Pete. On my system the Spider V is shown in the device manager under "Sound, video and game controllers". And even the audio drivers work.
The Spider V midi ports are shown in the new midi tools and I can monitor them with the new cli tool. When I start the Line 6 Spider Remote application, the monitor shows a sysex-message that is sent to the amp repeatedly, and the application hangs about 1 minute, then opens and says no amp connected.
Switching to legacy API-Mode (1) fixed this for me, the amp gets detected by the application immediately.

Discord
https://ptb.discord.com/channels/980245825202552942/1539035628111528017

It's not clear where the error is, or what the error is. The data flows through the service just fine, and the client-side callback events fire showing that the message data is transferred. It's exceedingly strange that only these devices are affected.

Devices include

• Line 6 Helix
• Line 6 Spider

Issues include

• MIDI 1.0 data not received by client apps
• Line 6 management apps do not detect the devices

Reverting to legacy mode fixes the issue for customers.

These devices use their own combined audio/midi driver.