Odd MIDI signal - W2 and Logic Pro X

[redder2]

Odd one here, and likely a NORD rookie mistake. I've been scouring the web but haven't hit upon the keyword combination that solves this. I hope one of you fine folk has a solution.

When my Wave 2 is plugged via USB-C into my MacBook Pro (2021) and via audio cables to a Focusrite Scarlett, which is also connected to a laptop USB port, there is a repeated and annoying note that just drones on every few seconds. It seems as though the Nord is receiving a signal from the laptop when Logic Pro X is running, but I have no idea where from. It seems to happen on both audio and MIDI tracks. I've never had this issue with any other hardware/software combinations.

I'm at a loss.

Help...

Thank you, Jeff

[pterm]

Please post a recording. Nord uses unbalanced audio cables, so the audio and USB share a signal return path ("ground loop"). USB2.0 uses a 1kHz frame, so if you hear an unexpected 1kHz, its likely coming from USB via ground loop.

I recall a case in the past where running the laptop on battery (disconnect power cable) made the sound go away. I don't think this applies to the way you described your wiring but it is an easy thing to try (and if it remedies the issue it definitely indicates ground loop).

[Jeffmac]

You might also make sure that Logic doesn’t have a control surface set up that is now addressing the Nord MIDI ports.

[redder2]

I will record what's going on tomorrow and post it.