After using this mixer for a few months it mostly works great

Almost all electric guitar pedals use negative for the center and positive for the sleeve

touchy and fussy and overloads easily, but it works well when used within its somewhat limited parameters.

The build quality is sturdy for a sub-$100 mixer and the controls are straightforward and for my basic use, very adequate

This mixer is compact and functional, uses TRS stereo plugs throughout, and has separate volume control on all inputs and outputs (adjusting headphone loudness doesn't affect the mix, or the output, or the recorder output.)I haven't tried just plugging a mic into one of the 'line' inputs, but the GAIN stage looks like it could handle that fine.