Over on the website, ukuleleyes.ca there is an excellent article that describes the different choices of bass instruments that you could add to a ukulele ensemble. One of options mentioned was the upright bass which has also been considered a must-have for many classrooms. I have one where I teach that has been around since before I came along.
The thing about the big upright bass is that mine isn't the highest quality bass and I find it quite difficult to play. With D6 tuning, you can do a lot of I-IV-V chords in the key of D by playing all open strings. However, since I made the switch to C6 tuning, the open strings aren't a viable option anymore. In the ukuleleyes article I link to above, the authour Steve Boisen mentions the Kala U-bass as another alternative for adding a bass to a ukulele group or classroom.
The thing about the big upright bass is that mine isn't the highest quality bass and I find it quite difficult to play. With D6 tuning, you can do a lot of I-IV-V chords in the key of D by playing all open strings. However, since I made the switch to C6 tuning, the open strings aren't a viable option anymore. In the ukuleleyes article I link to above, the authour Steve Boisen mentions the Kala U-bass as another alternative for adding a bass to a ukulele group or classroom.