This is instrument can be such a challenge to play in tune. This is certainly one of the best Serpent performances on RU-vid. “I bend the knee my lord “😊
What maker is your serpent? I see two keys, is there a third on the back for B natural? I would really like one! I have a 3D printed one now, and I think it's time to move up to something a bit better.
It's a Pierre Ribo after an original in the collection of the Musical Instrument Museum in Brussels. It has 4 keys - the C# and F# you see on the front, but also a more subtle D# that you can see close to the C# key, wrapping around from the front to the back, and the B natural key for the thumb on the back.