After the listing training all test persons declared that they felt much more relaxed than before and had observed improvements of the voice development. The voice analysis showed partially a more regular vibrato as well as a shifting of the formants while changes of the control mechanisms were revealed by the biological data. Because of constitutional differences the effects of the listing training deviated between the participants thereby not allowing a final conclusion up to now, which of the changes are to be considered as results of the daily breaks and which are due to the special effects of music.
