Well, the M1 is passive... so the signal it sends is high impedance, while the mic input on your Mini is low impedance... running it through a different unit (the Behringer) and out must be giving the signal the transformation from high>low - that's why it works through that input.
When you go into the regular channel on the Mini, the signal from the M1 is again "stepped down" to low impedance, BUT the channel "wants" to hear a high impedance signal... so you have to jack the controls around to get the sound you want... in essence, the input signal is weak when compared to what the input on the amp wants to see...
As for the feedback? Well, welcome to the Wonderful World of Amplifying Acoustic Guitars!
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"Home is where I hang my hat,
but home is so much more than that.
Home is where the ones
and the things I hold dear
are near...
And I always find my way back home."
"Home" (working title) J.S, Sherman
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