The issue with recording with 2 mics

With recording one sound source such as an acoustic guitar, one needs to be aware of phase issues when using 2 mics or more for the same source. 

A sound wave against another sound wave, when in relationship to the same source could present this problem. Therefore correct any sound issues by playing with the on/off switch that handles that particular channel's polarity. 

Any phase issues could be resolved this way. Another way is by simply making a premix in a board and going into one channel of the interface. 

Great playing!!!