untune

verbs

cause to lose one's composure
discomfit, discompose, disconcert, untune, upset
cause to be out of tune
"Don't untune that string!"
untune
antonym
tune
is a type of (narrower)
cause to change; make different; cause a transformation
"The advent of the automobile may have altered the growth pattern of the city"; "The discussion has changed my thinking about the issue"
alter, change, modify