I use this cable for two outputs (my computer and my iPad) and both go through one input through my headset. That works great! The only downside is that either the computer or iPad will get louder, but not by much. I also have no problem with constantly switching the volume back and forth. I can hear both sounds perfectly if I adjust the volume for each of them the way I want. It appears to be a physical issue, not a manufacturing defect. I don't think you can avoid the volume difference without adding some technology as it seems to be the product of each device's output voltage that determines which is louder. Overall I really like this cable and I can hear my computer and iPad at the same time (especially when I'm gaming or working and need to hear both).
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