Piano Answers

A teacher of mine recently purchased a newer digital piano, & is willing to sell me his old Clavinova CLP-311, & I was wondering how much one would expect a used one for, if anyone could provide me some info. He’s asking around $800, & in fairness, it was recently fully repaired & made essentially brand new. But still, i know that it’s an old model so I’d like some feedback. Anything to help would be great!

I have a yamaha clavinova CVP 309 series digital piano. I heard that there was a 16-track recoring system which lets you create your own band, by yourself, so you can have different musical instruments playing at the same time. I don’t know how to use it. Can someone please explain to me how to use it, i appreciate all information & i am awarding 10 points to best answerer. Thanks in advance.

I have a Clavinova CVP – 105 & have a key that is stuck or lost it’s weight. I need to get inside the piano to repair the broken key – can anyone help me?
Just need to know how to take the casing off the piano please?