Hello, I have been playing the double bass for about 3 months now. I have been working through Francois Rabbath's Book with my teacher and I am now working on the 2nd Etude. Several times in the etude, there are Trill markings above the notes. From what I know from my school Band Director, When playing a trill, you are suppost to trill to a note one whole step above the "trilled" note. My problem is, I have never heard a double bass play a trilled note and I am not sure how I am suppost to approach it. Is it fast like a trill on a flute? The tempo is around 50 B.P.M. I would ask my teacher for advice on this but he is away this week so I am stuck on my own. If anybody has any recordings I could reference to, It would be greatly appreciated if you can direct me to these. Thank you in Advance.