Musical Instrument Audio Interface Device

FIG. 1 is a first top perspective view of a musical instrument audio interface device showing our new design; FIG. 2 is a second top perspective view thereof; FIG. 3 is a top view thereof; FIG. 4 is a bottom view thereof; FIG. 5 is a side view thereof; FIG. 6 is a side view of a side opposite that of FIG. 5 ; FIG. 7 is a front view thereof; and, FIG. 8 is a rear view thereof. The broken lines shown in the drawings illustrate portions of the musical instrument audio interface device that form no part of the claimed design.