The idea behind Voice Alert is to only transmit PL when transmitting voice. No PL when transmitting data. Transmitting PL all the time (by using PL on the radio) would defeat the point of Voice Alert and annoy listeners using Voice Alert to filter out the data transmissions.
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The following command will synthesize a 100Hz tone:
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ffplay -hide_banner -nodisp -autoexit -f lavfi -i 'sine=f=100'
There is likely a way to use ffmpeg/ffplay to mix this synthesized tone with the output of espeak but I haven't been able to figure it out.
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