Question: how alvin and the chipmunks voices?
Answer: In the 2007 CGI/live-action film adaptation and its 2009, 2011, and 2015 sequels, they were voiced in dialogue by Justin Long, Matthew Gray Gubler and Jesse McCartney. Bagdasarian Jr. and Karman continue to perform the singing voices for Alvin, Theodore and the Chipettes, but Steve Vining does Simon's singing voice.