This one is almost the same as BalanceLine but it uses H+L/2 of total number of days back not just 2 at a time. If you don't see it plots try to increase number of download days or reduce number of days back, the default setting is 5 days back.
This bband has 2 stddev value so that it can color the outer band and it highlights the band if price touch the band and it also do the alert if touch.