sad trombone vs wah-wah

sad trombone

• Used to indicate failure or disappointment. 

wah-wah

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

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

• to make a wah-wah sound 

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