I am new to sax, but was a B♭ clarinet player in high-school band (years ago); now I play some guitar and piano. I just got an inexpensive soprano sax (Mendini). Since it is a B♭ instrument, help me remember how to tune it using my piano. When I play a C on the saxophone, the tuner shows a B♭. Is that how it is supposed to be, and if so how should I go about transposing? Obviously I can't play from a piano lead sheet if that's the case.
Soprano and tenor sax are both transposing instruments, just like your old clarinet - all Bb. So, the tuner is telling the truth ! When you see a C on the dots, the note you blow sounds like Bb, 'cos it is Bb.
True, you won't be able to play verbatim from the piano charts, but an idea I used to use when I played Bb trumpet, was to 'learn to read wrongly', and transpose everything up a tone, so I could read stuff that was written for concert pitch (non-transposing) instruments, and the notes would come out in tune.