My keyboard has a transpose function which lets me transpose its keys up and down a given number of semitones. This consists of a button with # and a button with b.
So lets say I'm playing a tune where I'm playing B, A#, G#, F#, F, D# C#. How do I use the transpose functionality so as to play this tune on the white notes only. So, the notes B, A#, G# etc will all be playable via white notes. I'd like to do this as quickly and as easy as possible each time I make up a tune with black notes in it. I don't wish to use paper to work it out but an online tool would suffice.
I play the keyboard in order to compose music.
Additionally, how many times do I press the # button in order to play a tune in E Major on only white notes?