This article describes a set of "textual" technological practices that have been emerging over the past decade in the work of underground electroacoustic and computer music composers, focusing particularly on Florian Hecker and Russell Haswell. Guided by methodological insights from the field of software studies, the article zooms in on two computer programs, PulsarGenerator and GENDYN, presenting a genealogical analysis of them as cultural objects and outlining how these lines of descent are aestheticized in their works. In the hands of these artists, sound synthesis procedures carry an author function, and this transgresses both their legal status as technological "inventions" rather than texts, as well as their ontological status in the electroacoustic music genre. Combined with a compositional focus on "sounding" the materiality of these technologies-the particular affordances, limitations, and quirks of their operative functioning-this textual practice contributes to a new aesthetic, one that challenges the prevailing logic of secrecy, alchemy, and semblance in this music. Using the notion of "ontological politics" inherited from science and technology studies, I show how these practices highlight zones of contestation over electroacoustic music's ontology.In 2008, a piece of code was shared on the online forum for users of the graphical programming environment Max that was purported to be the work of the British electronica duo Autechre. Autechre are a notoriously clandestine outfit, especially regarding their working methods, so this rare insight into their téchne naturally garnered some interest. The code itself is visually very messy and the only instruction on the screen is to "load a short .aif and then press spacebar." This action launches a sequencer that triggers polymetric patterns comprising short synthesizer sounds; they approximate kicks and snare drums, as well as "laser" sounds, so-called "gabber steps," and other sound effects. It sounds a bit like Autechre, at least close enough for the code to be debated in nearly 150 subsequent posts. The discussions it elicited ranged from the question of whether or not information "wants" to be free; to what constitutes an instrument and what a "trick" or "effect" in electronic music practice; to the role software environments play in creativity and whether they should be credited in CD publications; to questions of open and closed source software and the types of behaviors, secretive or pedagogical,