retune
/riːˈtjuːn/verb
with obj.
1- tune (something) again or differently, in particular重新调节, 尤指：
1.1
- put (a musical instrument) back in tune or alter its pitch给（乐器）再调音。
1.2
- tune (a radio, television, or other piece of electronic equipment) to a different frequency为（收音机、电视等）重新调谐。