Stab in the dark here, but it might be the midi-to-TRS cable you’re using to connect to the 404.

I was having trouble getting a midi keyboard to listen to/read my 404 until I learned that there are two different midi-to-TRS cables. I believe the 404 uses “Midi B,” while the first one I tried was a “Midi A” cable. Luckily I seem to have collected a few of these converters and a different one ended up working. I think the only difference is what connects to the tip or ring of the cable.

If this is your problem, I’d see if you have another converter cable lying around, or see if maybe your Kenton has an option to switch the polarity of the signal it puts down the midi.

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