I’m here just to join you shouting out. Great peace of software.

Best match I could find: https://en.m.wikipedia.org/wiki/Public_address_system

We called it the PA. Back in the day when I was involved in organising and setting up parties and small concerts. (each about once a year). Not very accurate (looked it up just now) , but you might hear it referred to as such.

Yellow brick

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This might turn in to something worthwhile: https://smallandroidphone.com/