looping over a range

Hey hey,
I'd love to loop a variable over a numerical range. the goal is to alternately 
process groups of measures on a track. I naively tried and failed with:
for beat in {1..100{ {
   g ($beat * 2);
   sel 2;
   if (($beat % 2) == 0) {
     ... # processing here
   } else {
     ... # Alternate processing here
   }
}

It failed, because the variable beat was set to 1:100. Short of putting in all 
the numbers I can't see how to achieve this goal. Any ideas, please?

Best wishes and TIA,

Jeanette

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