The "triple roll" is basically a standard roll with one extra gracenote thrown in. Rather than giving the appearance of the same note played twice, it sounds like the note is played three times. Have a listen to the tutorial, and it'll probably make more sense!
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Hmm...are triple rolls
Hmm...are triple rolls applicable only to E, F# and G? Is there any technique I can use to simulate triiple rolls for A and B? Cool site, BTW! Lotsa useful info.