Two inputs to one output - guitar/synth - potential problem?

All frequent questions on switching: true or not true bypass, transistor-based or mechanical.
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Beedoola
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Post by Beedoola »

I'd like to be able to use my synth and guitar simultaneously - Battles style : )

I'm currently just using my TB looper to switch between the two but that method doesn't allow me to use both at once. If I just build a box with two inputs going to one output, will that cause any issues/is that problematic? I know the Boss LS-2 can have to effects running parallel but that involves all the inards that make it happen.
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Hides-His-Eyes
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Post by Hides-His-Eyes »

You can do better than that. Put each one through an inverting buffer and then use an inverting summing amplifier. That'll let you have volume controls or a mix control, no interference and it'll take like, 10-15 components.
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