Alternative to MidiPipe?

I have no knowledge of MIDI, but I am in need of help.

I am recording my electric drum kit using GarageBand. All works fine, but the "half-open" position of the hi hat makes no sound - it's a dead spot. After some quick internet search I found this video: https://www.youtube.com/watch?v=X6l2rXCXIpg. If I understood correctly, solving the problem is easy and I would need to change the "dead zone" hi hat key to be then same one as the open one. This way the dead spot will make a sound.

The thing is that MidiPipe is not supported by the latest versions of Mac iOs and I had no idea what MIDI was like 1 hour ago... so I don't know what to do next. Could someone point me to a software that would do what I need to do? Or maybe another solution? Thank you so much!