One of my favorite Transformers of all time is Soundwave.  He was one of the first Transformer toys I had when I was young. He was a Walkman Cassette Player that transformed into a robot, and he had Cassette Tapes that could transform into various robots, such as Laserbeak who transformed into a robot bird. For a present for my Brother I decided to make a mini-Soundwave out of Lego, complete with cassette, both which would transform.  Below is a video showing the transformation, and also a gallery which includes comparison photos with my original Soundwave toy.

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Soundwave 5

Soundwave 3

Soundwave 6

Soundwave 4

Soundwave 2

Soundwave 1