use Matlab to get the low-pass & high-pass filtering for an audio file

Low pass filtering and high pass filtering of the attached audio signal. Basically, you should be able to convert a regular voice to a deep voice (low pass) or a high-pitched voice (high pass). We just want to see how a voice is pitched by filtering. 1- Processed audio file needs to be submitted 2- Matlab code needs to be submitted. thank you