Yes. That's the same as mine STe. I hear doing memory test the same way (my file Color_&_Mono.zip). I also hear the dashes as they come up on the screen. But I hear them on left channel, maybe someone of us have swapped channels during recording.
So it looks like every STe, probably every Mega STe, even TT (by the post above) are doing this.
The question is if your STe DAC Fix would fix this or at least improve this. Or maybe there is another solution to solve this. I know... it's a detail... but...