Make it Stop

We have this electronic keyboard thingy on which I like to have a tinkle (so to speak), Lyra likes to have a bash, and Eloise likes sometimes to play a bit of music.

It does have this problem however, a feature which is supposed to be a tutorial device but which plays Twinkle Twinkle Little Star and other annoying tunes using a General MIDI palette of sounds. Endlessly, and at high volume.

The worst thing is Lyra is learning to bogle to it.