If I'm not mistaken, sysutils.beep doesn't work on android. It does not give an error, but it does not give sound.
An example study about sound;
lazandroidmodulewizard-master\demos\GUI\AppSoundPoolDemoYou can find it on the way.
Or a hybrid application
ToneGenerator toneG = new ToneGenerator(AudioManager.STREAM_ALARM, 100);
toneG.startTone(ToneGenerator.TONE_CDMA_ALERT_CALL_GUARD, 200);
toneG.release();