Plot and Play

In this program you can draw curves of several instruments on the graph.
y-axis of the graph corresponds to pitch and x-axis corresponds to time.
You can draw upto 6 instruments on the graph to make polyphonic melodies.
You can loop the sounds and modify the curves or add new ones on the run.
You can change the playing speed.
You can also add silence (using black paint) to the places you like.
This way you have infinite different ways to create melodies.The program can play melodies automatically.
You can also play it manually by touching the screen.
In this mode the program plays the sounds with pitches corresponding to your finger position.
By drawing different graphs and touching different positions or dragging your finger you can generate exotic sounds.
Hope you enjoy my program.
Your suggestions or reviews are more than welcome.