Where can I look for the gear Coen Janssen uses?

Find and submit the pianos, keyboards, synths, microphones, and other instruments used by Coen Janssen.

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 "Coen Janssen studio" and "Coen Janssen live" and spot gear that way.