Anything I should be concerned of (like impedance or whatever) if I plug my guitar on input 1 and my ipad (through headphone jack with 1/4 adaptor) on input 2? I need to use my Ipad for my iMPC/drum machine app and I'm trying to avoid separate amps. Sorry if this may be a stupid question. Thanks.
It should be OK but you may have trouble adjusting levels. The H9 has a control for input gain but it works on both inputs. The guitar's output level is much lower than the ipad's so, unless you turn down the ipad's, it will probably clip/distort. If you turn down the iPad's output level by a large enough amount it may sound noisy. Good question though. Let us know how it works out.