YV-3030MS Vibraphone and Comparison with the YV-2030MS.

Two new Yamaha vibraphones add a breadth of new features for percussionist of all ages. Music educators will appreciate the new features such as a gas spring height adjustment mechanism that makes it easier to set the instrument to the ideal height for players of any stature. The models differ in bar size, instrument width and application. The YVD-10 and YVD-20 variable speed drivers are each sold separately.

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What do you mean when you say the 2030 starts and stops wherever in needs to? I'm not sure I understand, does it mean the motor turns itself on randomly?