When trying to hack this sampler, I was unable to create a play/play button, as opposed to the play/stop button that is programmed in the circuit. 
Has anyone seen a cheap sampler that plays a sample from the start when you press the play button, and plays the sample from the start AGAIN rather than stop the sample when the play button is pressed again? Any feedback would be GREATLY appreciated. 
Thanks again for the hack schematic, I am currently trying to make magic with it.