The Zoom seems to be the only one with a stereo, line-in connection that would allow you to bypass the onboard mics and used outboard audio systems.

Cheers,

Gary cool
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)