Continuous tone generator?

I've tried the media player, soundpool and beep to create a continuous tone without a break, but when looping, there is a short break in the tone - I've hunted high and low and can't seem to find a clean way of doing it, so any ideas would be gratefully appreciated!

I'm generating this tone to then feed back to the mic input via a switch that I then detect with audio streamer - effectively having a wired switch in that I can then subsequently detect timed switch events, but I keep picking...

Continuous tone generator?

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