We've found filters and gains that damp all modes. All violin mode (1st harmonics) are damped to under 2e-21 in strain, shown in Hrec here (and zoomed here).

Since gain values may need to be changed, we've keep the config default values as zero; the working values are stored in the GUI code. After a recompile, you can press "SET ALL gains" to reset to these values. The current working settings are also attached here. We note that only WI requires 60 deg phase correction (use filter 2). We haven't checked to see if all WI modes damp better with this.

At max, we are driving 0.02 V per correction signal.