Two texts on electroacoustic music, written by Dariusz Mazurowski are available online now. The first one, about the history of sound processing and editing is in Polish: https://documentcloud.adobe.com/link/track?uri=urn:aaid:scds:US:6ef19e2c-314c-493d-b6ea-b17cf92f9162
The second one (Space, diffusion, perception. Selected techniques and processes concerning spatial sound in acousmatic and mixed music) is in English: https://documentcloud.adobe.com/link/track?uri=urn:aaid:scds:US:7717152e-0eba-4096-a052-b1075bd6d20e
Supported by the Ministry of Culture and National Heritage of Poland as a part of “Culture on the web” program.