If you have any idea what it could be, I'd love to hear from you.
-- Hoggres

I don’t have a definitive solution, but I do have a few suggestions to consider:

-- modular01

Hi, thank you very much for your suggestions.

I tried already the technics that you mentionned in Approch 3.

Also, since I don't get any noise when I plug in other synths, including when recording, I don't think there's any of the interference described in Approach 4. But I'll keep that in mind in case I run out of solutions.

Approaches 1 and 2 are very interesting and I'm going to try them out as soon as possible. I'm just not sure I understand exactly what Approach 2 is all about. Can you give me a little more detail?

Thank you very much for your help