Few re-recording mixers have carried on the "laff box" tradition. In addition to Bob Douglass, Los Angeles-based mixers Bob LaMasney, and Sound One's Jack Donato and John Bickelhaupt currently specialize in audience sweetening. While modern digital machines are not as cumbersome as Douglass's original machinery, Bickelhaupt confirmed they "are pretty anonymous, with knobs and buttons. We like to remain kind of mysterious — the man-behind-the-curtain thing. We don't really like to talk about it too much." Bickelhaupt added that "most of the time, what we're doing isn't re-creating a studio audience; the audience laughter is already there. But in editing, when sections of the show are taken out, when they take out lines to make the show fit a time slot — we have to cover the bridge between one laugh and another by using the laugh machine." In reference to the quiet laugh track employed on "How I Met Your Mother", Bickelhaupt commented that producers are increasingly "shying away from that big, full audience — the raucous sound that was more commonplace in the 70s, 80s, and 90s. They want a more subtle track." Bickelhaupt concluded, "I have a great job. When you sit and work on comedy all day, you can't possibly get depressed. When people ask me what I do for a living, I tell them, 'I laugh.'"