Marcus Schossow

"Then the MIDI keyboard, it's a really simple one, Oxygen, also nothing special." (1:01)

Given the details visible while the Oxygen controller is on screen, the controller shown is likely to be the 49-key model (as the 25-key model does not have vertical sliders along the middle of the unit).

28 seconds into his YouTube video, Marcus Schossow expresses his disdain for this particular speaker as he zooms the camera in on it:

"Sounds like shit, but it works like shit... Sounds come in, sounds come out. Really simple."

"A Saffire LE sound card, looks like this... It's okay, not that expensive actually. I think I got it for €400 or something." (:38)

"And then you've got this little thing here, this is a MIDI controller from, uh, Novation, called the Remote ZeRO SL. Just controls... basically, the whole thing is controlled by it, um, this is the volume stuff." (1:07)

In this Instagram photo of Marcus in his studio, one of the MIDI controllers in front of the screens has about 20 black keys visible (suggesting 29 white keys) and the signature modulation and pitch wheels, volume slider, and blue lights on the left-hand side of the controller. These are indicative of the 49es model Keystation.