Moving airplane causes Stereo Sound Doppler effect.
GTKAda: Adacore 2020, Source Airplane moving in the screen and the Listner location is relocatable.
OpenAL: Coreland 1.1.1, Stereo Doppler effect, Soure: 1000Hz PCM Mono tone sound file.
Timer Interrupt: Locate next position, Cycle: Programmable.
X,Y Location: Calculation X=Sin(2Pit)+X0, Y=Sin(2Pit)+Y0.
Doppler Effect: OpenAL calculates with relative speed.
OS: Ubuntu 20.04.4.
Detail: https://n7sd.com/ada1-2/openal-with-gtkada-gui-sample2/