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This sort of stuff is very tough to diagnose from a distance. Obviously it would help to rule-out each component, so perhaps try some tests without the splitter, and without the switch.
Are these pure passive devices (just jacks and wires), not a DAC or external sound card?
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Chris C.
1973 914 "R" (914-6) | track toy
2009 911 Turbo 6-speed (997.1TT) | street weapon
2021 Tesla Model 3 Performance | daily driver
2001 F150 Supercrew 4x4 | hauler
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