A few weeks back /u/trunolimit made a post pointing out that the Awesome Mix cassette from an older Lego set (76217) doesn't fit inside of the newer Lego Soundwave's chest.
I've made my own version of the cassette that does fit and there's a free parts list and instructions over on the Lego sharing site Rebrickable
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I've made my own version of the cassette that does fit and there's a free parts list and instructions over on the Lego sharing site Rebrickable
https://rebrickable.com/mocs/MOC-237043/ClintM/awesome-mix-cassette-for-soundwave/#details
I didn't want to make the cassette too wide so you can actually fit two of them in there.