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One of the pins is programmed to produce a constant 1000 KHz square wave using PIO. The main program then turns the PIO on and off at the intended frequency. e.g. to emit an A4 pitch (440 Hz), it turns the 1000 KHz square wave on and off 440 times a second. To the radio receiver, this means a 440 Hz square wave audio. Using this technique, it emits the well-known Shave and A Haircut melody on a loop.
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There are some techniques that can be used to reverse a relationship if the flow of logic requires it. For instance, the higher-level module could expose a required interface which will be implemented by the lower-level module. That’s the Dependency Inversion Principle on the module level. One of the other possibilities is to introduce a mediator pattern.