The delay-only code has been updated so that the only thing that needs to be configured is the delay time in seconds.  The program automatically allocates the biggest buffer it can from heap space and increases the sample rate to the maximum for best quality. However, the sample rate is capped at 40k/sec as in practice the quality is really going to be limited by the 256 level output of the Digital/Analog converter.   A 12 second delay still results in quite reasonable sound.