the regular express pass during the daytime is free.
the express plus pass in the daytime has a fee, $20 - 35 depending on the season.
for hhn, the express pass is cheaper if you buy it at the time of your hhn tickets.
holders of this express pass gets a separate line by passing the long regular one for all the haunted houses and all the rides.
last year, two of the workers never marked/punched/scanned my ticket and i was able to use it again.
the express pass for hhn looks like the admittance ticket. it is programed for one visit for all rides and houses.
if you need more 411, let me know