All Basenjis can make a single bark. :p
Yesterday he actually strung a few of them together! I can't be sure if he actually fully stopped making noise in between, but he was playing with the chihuahua again and decided to let out a bar-rawr-rawr-rawrk! lol
There is normally quite a difference between a Basenji 'bark' and that of other dogs even when they try to copy dogs that do bark.
I had a Basenji staying here who did in fact bark like other dogs and I suspected that he might have another breed somewhere in his pedigree.