Output Devices

For my final project I want to use the sounds I record as keys that you can play like a piano. In addition to playing them, I am also controlling the speed/pitch through a potentiometer and there is also a loop switch that when switched onnwill restart playback each time the sound ends, effectively looping the sound. Because I want to use multiple ISD1820s I had to combine the outputs from all of them and this required using some resistors so that the signal doesn't clip and maybe in the future I can add a volume control for each ISD1820 so I can having mixing capabilities.