Slow sweeps through lower frequency range of the experimental T-bridge to explore self noise (harmonics, rattling, buzzing, etc). The [Sympath](https://daveriedstra.com/sympath/) is an open-hardware electroacoustic string resonator instrument designed in 2024 which I am continuing to develop. Read today's [blog post](https://daveriedstra.com/sympath/blog.html#2026-06-18) for more about the current exploration. (Correction: sweeps use a heavily filtered saw, not a sine as mentioned in the video.)