Set hard timing error buffer to be 0.5s + the sched ahead time:
Set hard timing error buffer to be 0.5s + the sched ahead time:

* TODO: make this 0.5 user-configurable
* See what value works best on the RPi.
jweather/sonic-pi,jweather/sonic-pi,jweather/sonic-pi,jweather/sonic-pi,jweather/sonic-pi