Good enough is relative. How good do you want it to be. I believe that the proper way to go about this is to at least have an input buffer op amp (or some other buffer ina134 etc...) for each of the input signals then that way you can cator each input the the proper impedances and gains then mix them all down with summing amplifier circuit. Either way Id say try just the summing amp and see if it works for you. Good luck, keep us posted
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