The game: "Animal Math" by Donald Pavia (1986, open source Pascal)
The problem: PC Speaker song plays at about 10x normal speed with Dynamic Core.
Auto Core sporadically has the same problem.
The song is supposed to take about 20 seconds to play, but it can be over in
as few as 2 seconds in DOSBox. The song plays at normal speed in real DOS
on my Core2Duo laptop.