Bought "Dance Sensation" - Doesn't work when broadcasting music to a device


I bought the ‘Dance Sensation’ effect. I wanted to play music on my echo while using this effect. I set Audio Source to ‘device audio’ as I am broadcasting the audio from my device to another device. This makes dance sensation do nothing.

I know I could set it to ‘microphone’ but I find this doesn’t work as well as ‘device audio’. Is there no way to make this work in this way? Is it a bug?