The whole page flickers in Firefox on the PC. I think it's the images as that flickers in the feed too.
I bought the interface that would give me more options. I've not used the MIDI, but that is something I want to explore. A lot of devices use USB now anyway. I could set up multiple drum mics, but I have the Yamaha EAD10 that records the whole kit. That also does USB audio. My Roland e-kit does audio and MIDI over USB. I've really got all the gear I need to make music.
I think the main original purpose of MIDI was specifically for live performances.
So if you had a drum-machine and several synths one player could operate any of those with the same keyboard or even at the same time.
This was in the 70's I think that it began so the computer aspect wasn't even part of it yet. On the computer I will use it to play virtual instruments.
Oh also, you can make .midi files that are portable music for any instrument.
I've never seen one of those Yamaha drum mic devices before, but that's pretty cool.