or
oswatchclip.mp4
Kdenlive
LibreOffice Impress
SimpleScreenRecorder
espeak -v en+f5 -a 100 -p 50 -s 110 -f slide2.txt -w slide2.wav
fluidsynth -a pulseaudio -o audio.alsa.device=hw:1 -m alsa_seq -l -i /usr/share/sounds/sf2/FluidR3_GM.sf2 moonlight_sonata.mid
this one works best : timidity moonlight_sonata.mid -Ow -o out.wav