Audio Software NEEDS on screen MIDI Keyboard & Output

I have audio software that needs an on SCREEN midi keyboard added. I need users to be able to show a small mini piano with 12 notes. That displays each of their notes. And when user clicks on a piano key - it plays the corresponding pitch. It would need to accomplish this via MIDI output. I can design the piano and GUI. I just need the functionality. It needs to have * The ability for users to click on a key - and the key depresses and plays the corresponding PITCH via Midi output * Display the KEY name being pressed : (A, B, C, D, E, F, G, A) * Should have a volume control * Plays piano only (not other complicated instrument selections) * Would allow user to PLAY the keyboard notes by using their keyboard KEYS * All notes start at middle C * SHIFT + (key note) shifts the pitch up an octave * Simple