Register Key For Mount & Blade How Can I Find Out The Key Register Of This Moeck Recorder?

How can I find out the key register of this Moeck Recorder? - register key for mount & blade

I found in a secondhand shop, and found that it is an alto Rotter Burgh online, but you do not know what number I fill in the holes of the flight, is to record the sound? One can then note on my keyboard. I want to sell, but I like to describe accurately!