Good morning, some good questions from new Holeyboard 123 owners. Guy L. sent me a message about the setup with a slight rocking on a hardwood floor.
In your hardware package, I neglected to put this in the setup video and manual, but I am adding it now, are two back feet, they are rubber C-channel sections. You do not need to use them, however, they work great, keep it from slipping, protect floors and can take out any rocking. The Holeyboards will settle in after loading them up with pedals.
Let me know if this makes sense or if you have any questions at firstname.lastname@example.org