YouTuber Bertoaus walks through the process in the video above. It’s not the simplest hack in the world, but it doesn’t look too difficult either. Bertoaus explains the process:
The Zoom H2 has that (hidden) possibility, because it can record the sound of the 4 build-in microphones simultaneous. The only thing we need to do is to construct 4 line input plugs and 2 two pole switches.To change the soundlevel we solder some resistors and condensers in the box. As reward for the modification you get a cheap multi track fieldrecorder in the palm of your hands.
A good four-track portable recorder isn’t the easiest thing to come by, even if you’re willing to pay more for it, so this is a very helpful hack for those who need several inputs on the go.