Valves on the right are the main notes in certain combinations. The valves on the left are the sound effects and the transition to the second octave (the ability to play particular note an octave higher). The valve at the bottom is the switch button to Setting where you can choose the instruments, hint melodies and etc. All the sounds of the instruments are real studio recorded live instruments - trumpet, tuba, flute, bagpipe, oboe, jazz trumpet, French horn.
Tired of blowing? Turn on the simple mode and play without blowing. You can also select melodies. In this case, red hints will appear by the side of the keys to be pressed. You can learn notes in the section 'Finger notation'.
Free Toootle app version includes 2 instruments trumpet and oboe and also 3 hints for melodies which you can learn for these instruments. Toootle Pro version is paid. It includes 6 more wind instruments: tuba, flute, bagpipe, jazz trumpet, french horn, zhu di) and additionally 12 popular melodies with hints.