AFSK Audio doubling with multiple position transmissions

[galenasphaug]

This issue only happens with tracking stopped (manual/single-shot TX only) and with AFSK output over phone speaker:

Steps to reproduce: Press 'Send Position' button twice quickly.

Expected result: Two AFSK transmissions played one after the other.

Actual result: Overlapping AFSK tones played at the same time, not decodable.

Tested and reproduced on Google Pixel 4a and 6a, both running Android version 13.

[ge0rg]

Thanks, I need to rework the audio output to implement a send queue instead.