Next, I tried timidity with pulseaudio and I got sound! It worked very well, no crackling, good sound, metronome and progress bar worked, as did the lyrics indicator. I used the standard timidity command that is programmed into kmidi2, without adding any further arguments. Earlier, I had tried timidity with alsa and the standard arguments, as programmed into kmidi2, but got no sound, even though it was obviously playing. Also, I had tried to start timidity from the command line, but nothing happened at all (I typed timidity, followed by a carriage return).