The feedback resonator, a device that uses contact mics and an audio transducer on an object with specific routing to create a controlled feedback loop, ultimately creating an interestingly layered sound.
This initial version of the experiment uses routing that can be explained as such: 
Starting with a digital audio source (a DAW to start with, but custom software may be developed later), a signal will be sent to an output (OutA). OutA will be an audio transducer attached to an object which vibrates the object, essentially converting it into a loudspeaker. One or more contact microphone(s) will be attached on the same object to receive the resonated sound. This signal (InA) will be routed to an auxiliary (Aux) with a level control, with the output of Aux being routed to OutA. InA will be routed to another output (OutB), which will be the 'final result' output.
Applying any level to Aux will result in feedback, so due to this some form of limiting is needed on OutB to prevent digital clipping.​​​​​​​​​​​​​​

The use of an auxiliary channel opens up avenues for adding an FX chain within the loop, which is something I briefly experimented with but will take further in the next iteration. 
The resulting sound has a lot of potential, especially in the drone-like effect generated from the resonance of the object used (a small coffee tin in this case). The application of a reverb in the chain and without using any external stimuli (i.e. the synth playing), opening the auxiliary generated a very haunting, ethereal sound, which is something I will be experimenting with more in the future, perhaps using no-input style techniques with a mixer, and feeding that sound into the resonator. 
I also aim to digitise this entire process in the future, by using resonance calculations and replicating the propagation effects on the sound. Perhaps even using some form of CFD (computational fluid dynamics). 

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