There was a boy trying to tune his boombox in his room somehow he was transported to a world or these puppets and monsters were transported to his room and there was something about a song or the movie was called wizzer wazzer or wazzer waddle woo

I believe my esteemed colleague Stardust713 may have previously answered this one:

https://www.askmehelpdesk.com/movies/childrens-movie-mid-1980s-187298.html?highlight=in+search+of