Tremulant
The way in which a tremulant is used in performance is in part a matter of personal preference. However, one general approach has survived as the most widely accepted basis for using the tremulant in classical and church organ music: use it judiciously, like adding just a touch of spice to a tasty entree.
In the early twentieth century, theater organ departed from the classical tradition by employing a fast-beating, heavy tremulant in essentially all stop combinations. This practice has enjoyed a large influence in the home, popular, and jazz organ markets.
To apply this heavy, throbbing theatrical tremulant in church or classical organ playing is considered inappropriate by most organists.
