the note C is middle finger down (left hand)when you are holding it
C
b flat
middle finger on top four keys
With your left hand (upper) press the first three fingers. For a high C add the octave key with your left hand thumb.
an a sharp is a b flat and that is holding down the C note the B note and the third key near your right hand that looks like a rectangle
if you want the actual saxophone part its C C FGAB AC CAC C FEDC ... repeat
a really really high note
Basically, you start on any note and go up a half step. This works on all saxophones. Go from C to #C to D to #D... ect.
adolphe sax invented the alto saxophone first, i believe
The written low Bb of an alto sax sounds a C# (or Db) in the middle of the bass clef, also know as C#3. The frequency of the note is 138.59 Hz, assuming the note is played in tune with A4 = 440Hz..
As on any instrument, C flat is one half step below C natural, and sounds the same as B. There are good technical reasons why a note might be notated as a C flat, but just play B.
C is the note after the note where you have a space in your fingers, and E is all of them down apart from the bottom one. (Keep the space at A and only the buttons. Not the different keys.) For a higher octave, hit the octave key by the thumb.