Where can I look for the gear Karl Schumann uses?

Find and submit the guitar rig, amplifier setup, effects pedalboard, and other instruments used by Karl Schumann.

If the artist is active on social media, check places like their Instagram feed and look for musical equipment they can be seen using.

You should also do a Google image search for things like "Karl Schumann studio" and "Karl Schumann live" and spot gear that way.