Undervolting Casio SA-20

I have experimented with the Casio SA-20, by reducing the power-supply voltage from 7.5V down to 4.1V. at this voltage the instrument starts to sound strange and become very glitcy. The keyboard makes random noises in a way that seems like internal datalines are being filled with errors resulting in wrong serial messages, hence the random sounds. It is still keeping up rythms very nicely though, so i have recorded some of the rythm/accompaniments from it, and uploaded them at freesound.org.

The sample-pack can be found here

Here is an example of how the Casio SA-20 acts when undervolted