4.4 Procedure
Each experimental session took one hour. First there was an eight minutes preparation that consisted of reading an ex-planation of the game purpose and how to play, and a short demonstration. After that, participants gave their consent and other information such as their musical experience and hearing levels. Participants tried set one as training for fif-teen minutes, then they proceeded to play with sets two to four for thirty-five minutes. We asked them to play with all types of sound in a set, though the order was voluntary. Fi-nally, participants gave post-descriptions of their preference regarding the type of sound.