i have 3 s4mk1 controllers and they all have the same problem! only one of the two outputs works. this happens both from the RCA output and from the Jacks. trying to find a replacement board but it's nowhere to be found! what can i do about it?
You could try putting in a support ticket, but you'd probably have to have a full repair rather than just get a replacement board. That's if NI actually have parts for the MK1 of course. You can do that on this page - https://support.native-instruments.com/hc/en-us/categories/360000053737-Product-Support
You could always run in mono rather than stereo? I used to do that anyway and no-one ever seemed to notice :)