In the two years following the proposed and trials of Sound Therapy (see Ellis, ‘Incidental Music’, BJME 12, 59–70) the approach has been further developed. Working in conjunction with a local special school a non-invasive therapy has been evolved which depends upon the use of music technology. This paper describes the background, development, and modus operandi of Sound Therapy and the ways in which music technology contributes to the programme. An account of the qualitative research tool, by means of which progression and development can be monitored and assessed, is also given. In conclusion, one case study, extending over two years, illustrates the results of this approach.