Perhaps this will be helpful regarding the Shure MV88 & Motiv app. I just put the mic near my Fender Princeton Reverb Reissue, and set the app to the 'guitar' icon. I did monitor with my headphones for a quick level check, and listened to a little replay.
I think it does a really good job, especially compared to the builtin mic in the iPhone 6S.
Regards,
Howard Emerson
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