This commentary details the methods and ideas involved in creating the seven portfolio works. The portfolio is comprised of stereo acousmatic works, one mixed work and a multi-channel work, forming the practice-based research completed during the PhD programme at the University of Manchester. The works explore a number of aesthetic concepts encompassing instrumental timbres, cultural sound objects, rhythm incorporation, habitual spaces (the kitchen), imaginary and real objects (jukebox), and visual art sculpture (origami). Uniting the portfolio works is the use of Denis Smalley’s spectromorphology (1997). In its intended function, this tool provides the listener of electroacoustic music with thorough and accessible sets of vocabulary to describe sound events, structures and spaces. The use of this descriptive tool need not stop here. Fortunately, and often unconsciously for the composer, it does not, since all composers create music that is spectromorphological with or without an awareness of its presence at work. In a reversal of conventional practice, my research approaches spectromorphology from an alternate angle, viewing the vocabulary as the informer upon sound material choice and creation. In this reversal, vocabulary no longer functions descriptively; instead the vocabulary precedes the composition, directing my compositional pathway in each piece. This new application, used as a method for selecting and creating sound in the creation of each portfolio work, is an attempt at systemisation and an effort to partly remedy the seemingly endless choice of possibilities we are faced with when beginning a new work.

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This work deals with comparison of individual types of electroacoustic transducers, their properties and practical use. Furthermore, design and manufacture of a magnetoplanar transducer, its integration into headphones and the production of headphone amplifier. The first chapter summarizes all types of electroacoustic transducers, their properties, advantages, disadvantages, and their use in practice. The second chapter deals with the classes of amplifiers. The third chapter deals with the choice of design of a magnetoplanar transducer, headphones, and selected type of headphone amplifier. The last chapter describes the production process of individual parts of the headphones, transducer and amplifier, including the final measurement.

My thesis covers the materials and methods of my composition, The Passion According to the Gospels of Matthew and John. It features an extensive analysis of Penderecki's Passio et mors Domini nostri Iesu Christi secundum Lucam. The research also covers some history of the Passion genre and its development. The second half of the paper presents a background and analysis of my work. It details many of the creative processes and methods I employed.

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