there’s a link error here I think
This is a live community edited document. Would you like to add your feedback instrument here? Please either send us the details or send us your pubpub account name so we can add you as an editor of this document.
These instrument are relatives of the Halldorophone, designed by Halldor Ulfarrson, Alice Eldridge and Chris Kiefer. More info here: https://www.feedbackcell.info/ingredients/
Till Bovermann (2016)
Half-closed loop operates by means of feedback induction on various levels. The performer manipulates a brass pipe containing a resonating string. A separate active sound board serves as the active element which, by momentarily connecting it to the pipe, can be used to temporarily establish a feedback path between the pipe’s string and the soundboard’s transducers. DSP-based filters and dynamic processing elements in the feedback loop help shape the resulting sounds.
https://tai-studio.org/portfolio/half-closed-loop.html
This instrument includes primary and secondary resonating bodies. More info here: https://zenodo.org/record/1178127
Two servos are moving a speaker in two axes, relatively to a microphone. In certain positions this setup creates specific feedback pitches. Information about all the pitches is stored together with the coordinates of the speaker. Moving the speaker back to a specific position (by the means of a midi keyboard) allows recalling specific feedback notes.
More info: http://krzysztofcybulski.com/feedbacksynth.php
Non-Larsen effect feedback setup - two boxes, running simple Pure Data patches, react to the incoming sounds by generating different kind of sounds, yet still they manage to create a sensitive feedback loop.
More info: http://krzysztofcybulski.com/feedboxes.php
Macro is an electroacoustic instrument for exploring small objects and their sounds. It is based on four microphones, combined with four drivers, for amplifying these small sounds through close-miking and feedback. A macro lens camera makes the objects and actions visible to the audience, allowing a very small scale performance. More: https://hvc.berlin/performance/macro/
The Gutter Synth consists of a number of interacting oscillators, each of which is a feedback system that exhibits it’s own complex behaviour. Combining multiple voices creates emergent effects as the different systems exert a strong influence on each other, tethering their development so that they cluster around certain frequencies, timbres, and behaviours.
Source code (Max): https://github.com/tommmmudd/guttersynthesis
Supercollider UGen port by Scott Carver and Mads Kjeldgaard: https://github.com/madskjeldgaard/guttersynth-sc
Listening: https://tommudd.bandcamp.com/album/gutter-synthesis