I needed a pedal controlled Step Sequencer for another effect I wanted to create too. So I made this new mono sequencer plugin called dm-Seq. With this plugin you can recreate the effect at 3:40.
Just follow the MIDI To CV instructions I posted here before. But instead of using one of the existing step sequencers use the new dm-Seq one.
Ensure dm-Seq’s Clock Mode is set to Trigger, assign a footswitch to the Trigger parameter and you’re good to go. You can edit the sequence, set the amount of steps you want to iterate through. And you could even iterate through the steps at random. That could be fun too.