MOTM

h3y all,
  is there a way to manipulate the duty cycle {for lack o' a better 
term} of *any* audio signal???  CD, guitar, wife's flute, etc?  was 
thinkin' 'bout static waveforms an'timbre/pulse width modulation 
while doin' the dishes an' had never considered the possibility about 
tweakin' the duration of the 2 halves of a waveform.
  does this make any sense?  is it a stupid thought with no answer?  
is it possible to achieve??
thanks,
doc