Those gameboys aren't even on. When he got the Novapad I noticed he was sampling gameboy tracks that he made it LSDJ onto it. Mostly though, if you were looking for a live setup you'd have maybe one of those gameboys setup with your drums/beat/riff for tempo into the guitar pedal (just to the right in the video) and then play the C64. There's more then one way to set all of that stuff up though, especially if you have a MIDI input for your gameboys or other effects processors in your rig.
I remember seeing that on Jeroen wall some time ago ! The gameboys only have pro sound and screens looks like they were backlighted but they doesnt seem to be On ! ...btw looks like there is only 1 thing plugged in that fx pedal when 2 c64 2 gameboys and maybe a laptop plays at the same time...where is the mixer ?!
Wow Tempest on cm.org !!! Welcome !!! Thanks for the link, always nice to have new mods to run on my amiga and there a lot of great musicians in this one !
