How to use variables to manage Polly voices

When working with Polly voices, using the pulldowns in the Voiceflow Speak blocks works great! But what if you have a large skill, with many blocks (and steps within those blocks), and multiple Polly voices for different characters? And then, what if you want to change the voice, or its prosody? This tutorial shows a technique for managing them using variables.
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https://voices.app/?p=1161
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