reverb vs wah-wah

reverb

noun
  • An electronic effect which simulates echoes or reverberations in the sound signal being processed. 

verb
  • To apply a reverb (electronic echo effect) to. 

wah-wah

noun
  • A wavering sound produced by means of a movable mute or by electronic means 

intj
  • The sad trombone sound, used to indicate failure or disappointment. May be used mockingly; also written wah wah and womp womp. 

adj
  • Modifying the resonance of musical notes to produce the effect of a human voice. 

verb
  • to make a wah-wah sound 

How often have the words reverb and wah-wah occurred in a corpus of books? (source: Google Ngram Viewer )