To play, touch/click each bar or press: (Numbers )1=C, 2=D, 3=E, 4=F, 5=G, 6=A, 7=B, 8=C', 9=D', 0=E' (Letters) I=F', O=G', P=A' To play Bb, press the down arrow key. To play F#, press the up arrow key. To return the notes to natural B & F, press B or F. Press C to take away the F & B bars (C Pentatonic). Press V to take away the E & B bars (F Pentatonic). Press SPACE to put the bars back.