I think they are all 16/44 except String Machine which is 16/88.
At least, I know Studio Grand is 16/44. Note that the sounds
are not raw but somewhat processed so 16bits is not that bad
considering that that’s what you put on a CD anyway.
And it is looped, after about 8 seconds, and that means that you
won’t hear the sounds ‘farting out’ at the very end due to the
bit depth.