Give your setup a test and see whether your setup is generating any buzzing / hum - its a pretty common occurance with the amount of different stuff all connected together and if needed give the above a try. when browsing folders on an Everdrive and also a lot of hum / buzz when the volume was cranked up pretty loud (mightly annoying) flicking the switch makes a world of difference. on a SNES, which was generating a high pitched whine at high volume e.g. into the RF jack of a SNES or Mega Drive and select the 'audio external ground' via the switch. You can then plug that 'audio external ground' into the input device generating the sound e.g. to one of the terminals I wired the common switch box ground and to the other a cable ending with a male RCA connector (but bear in mind that we are just interested in connecting the ground, not the signal part) for 'audio external ground'. adding a female 3.5mm stereo audio socket to the scart switch box, wiring the L and R channels to the switch box and the ground of that audio socket to the middle od a SPDT switch Just in case anybody runs into a similar problem a workable DIY solution not involving any external isolators / eliminators, which I found to work was:
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