When you change the delay time of a delayed sound while it is playing, it causes the sound to either speed up or slow down to adjust to the new timing. This change in speed can either result in pitch shifting or time stretching, depending on the algorithm employed.  ### Time Stretching Listen to the time stretching that occurs with the Dynamic Delay plugin. ![[modulating delay - time stretch.mp4]] ### Pitch Shifting Now, listen to the pitch shifting that occurs with a third-party delay by MeldaPlugins. ![[modulating delay - pitch shift.mp4]] Many plug-ins have the ability to change the behavior accordingly. By combining different delay times with high feedback amounts and modulating the delay time while the sound is playing, you can create some very interesting effects. Experiment to your heart's content! Listen to this Ras G song "Back on the Planet" to vivdly hear an example of how changing the delay time can affect the sound.