Jean-Michel -

Your table f2 is normalized. So this statement:
   kfco  oscil1i   0,ifco,idur,2
puts out a maximum freq value of 1 Hz!

However, this statement:
   kfco expseg 100+.01*ifco, .2*idur, ifco+100,\\
  .5*idur, ifco*.1+100,.3*idur, .001*ifco+100
has a 100 Hz offset built in.  This gets the cutoff of the filter above the
fundamental of the buzz generator.

Hope this helps.

-David.




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