I'm not familiar with the Zoom box, but my guess would be that it's for use between an instrument and an amp, so it's output(s) are probably not 'line level. On the one hand, the interface may need to be set to HiZ input for this approach to give results(?), but for me, if you're not using it for any effects, I would just plug the instruments directly into the interface (set at HiZ) and record them straight in.
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"As long as I stay between the sun & my shadow, I guess I'm doing well."
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