Okay, so it is exactly what I thought it might be - essentially triggering MIDI events with a signal frequencies from a set of ECG sensors. It's been done with other arbitrary things such as fractals and scans of planetary images as the input triggers, too.

Aside: A shockingly high number of people don't seem to notice that those haunting planet sounds we get treated to occasionally, are actually scans of images processed row by row (or column by column) to produce a string of numbers, that are then mapped exactly this same way.

Having said that, as you can tell from the play list, since assigning notes force it all to be in key, plus adding lots of echo and whatnot, you can produce some really interesting soundscapes.

It is a bit of a mirage though. The waves exist, but the mappings to their peaks are man-made. You could (and should!) map to a harmonic minor scale to get some amazing Eastern sounding music out of it. In the second playlist, you can see they've added a lot more control than the usual apps of this sort.

I consider most of this to be an interesting experiment in a different type of pseudo-randomness than we usually deal with on computers. And this one has a nice wooden package to go with it.