how Peart gets the toms and symbols to change is just electronics. his left foot that does the hi-hat. well there is 2 other peddles too. with his left foot he can control the tones. his xylophone looking touch pad controls many things. it controls the 360 spin, and all the other percussion for Rush's songs. this way he nolonger has to cart along the instruments that he used in the 70s. for example the song "trees" the mid section where he does the wood chimes, those were regular toms making the wood sounds. so he can do many things to control tones. all of this is hard to see on the youtube link. the dvds they have, this can be observed ... keep in mind he's been doing this touring thing for 30+ years. he prolly enjoys changing things around out of boredom.