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You should take into consideration how you plan on using the various hands free combinations available. You may need to start/stop auto scrolling, turn page/jump forward or backwards, etc., while in the midst of performing using both hands and you cannot stop to change something. I'm not a pro and have found I can get by using 2 pedals at most although I suspect there may be a time when 3 could be useful. I think 4 would be overkill unless there were many more options, an unusual situation, or new use for a page turner.