Using tone() for non-regular intervals

Using Arduino Audio
24

I see the potential of the bug :wink: that I earlier discussed.
millis() is unsigned long

long countpreviousMillis = 0; //stores count milliseconds
long countinterval = 1000; //1 second
OR
unsigned long countpreviousMillis = 0; //stores count milliseconds
unsigned long countinterval = 1000; //1 second

@jackwp
Thanks for participating.