These both concern software that is freely distributed. Shareware can involve a voluntary modest payment to the software’s author(s).
UNESCO DigiArts- Tutorials : sound and music applications (Mac & PC) ( English , French , Spanish )
Bibliography: Bossis, Bruno (2003). Practical seminar : Creating a simple electroacoustic piece in easy stages
Bossis, Bruno, Couprie, Pierre (2003). Tutorials : sound and music applications