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Similarly, if Blaster or Soundwave are KO'd whilst still having Mini-Cassettes beneath them, are the Mini-Cassettes KO'd as well?

They remain beneath their deployer wherever it physically goes.

For example, if Soundwave was KOd with Buzzsaw still under him, you would have Soundwave in KO, fully damaged with Buzzsaw underneath him with no damage. You could not I Still Function Buzzsaw, but if you ISFd Soundwave, Buzzsaw would remain underneath him when Soundwave returned to the battlefield. At the end of the turn, when Soundwave is KOd again, Buzzsaw would return to KO with him unless you had deployed Buzzsaw during that turn, in which case, Buzzsaw would remain on the battlefield.
Source: Wizards of the Coast (2019-07-29)    【Link to Ruling】
Tags: Blaster, Communications, Soundwave, Communications, Blaster, Communications, Soundwave, Communications