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What the "regular" amplifier does is interface with Sonic Pi, which is awesome software that'll make sound and music driven by code. Sonic Pi comes with an IDE of sorts that you can use to program the composition you'd like to play, and get immediate feedback from hearing how your code is translated into audio. It's a great way to lose track of time for a night or two (or more). However, I was envisioning controlling my audio from the code examples directly. I didn't want to have to work within the IDE.
In the earlier post on dependency injection, I created a PracticeAmplifier class that did nothing so I could use it in tests, rather than the "regular" amplifier.
To get around using the IDE directly, I found the sonic-pi-cli gem. Its principal use case is to be used directly in the terminal. However, it's a gem, and written in ruby, and the core functionality is available in a class that you can use in any of your code.