Nearly all the participants come to understand the relationship between their gestures and the sound at some level. Some take longer than others. For example, it was not until the third session that one participant who is nonverbal signaled his understanding by repeatedly looking back and forth between the electrodes on his arm and the loud speaker producing the sound. In addition to synthesized instrumental timbres, sound effects are very useful in group sessions. They work well for individuals who are not interested in music.
Some sounds can be very amusing.
Being able to make his or her group laugh can be a very compelling experience for a participant. Sound effects can also be used to tell stories and to role play. Although the children have severe speech and physical disabilities, they have sufficient control in some limbs to play in the Autotrigger Mode. They quickly grasped the concept. I have used it in conjunction with visual aids to teach them the names and sounds of instruments as well as elementary music notation.