Describe your request:
Viv told me to put this here since it would fit best in Communal helper.

A toggle swap block that swaps to a cassette beat, fairly simple premise hopefully. Every time a cassette block would turn on/off the block would swap to the other position. 

• Is your request a change to an existing feature?
  • It's not, but maybe you can reuse some code from other cassette entities.
• Is this something that will be used for an upcoming collab/contest?
  • It is for a collab which isn't releasing any time soon, but I would need the entity in order to start the map, so preferably sooner than later.