I have purchased a Tbox M3 in, out, thru USB MIDI interface in, out, thru USB MIDI interface sole here https://goo.gl/hPpHCG. This one is powered by USB, and has 1 MIDI OUT and 1 MIDI Thru. There is another one which is MIDI powered with 2 MIDI throughs?
I was wondering what if they are the same in terms of functionally?
Any help would be greatly appreciated.