J. Kissel, J. Driggers, P. Thomas, C. Gray, H. Radkins

After beating down yet another 500 Hz mode that had gone bananas we've now resorted turning off all automated damping (by skipping those steps in the lock-acquisition sequence). Further, (and what I think may have also contributed to the badness & confusion), we've turned off the automatic adjustment of gains during the VIOLIN_MODE_DAMPING state. 

For the record, I think all 1 kHz, 1.5 kHz and high harmonics are all damped enough or have rung down themselves enough that these are no longer a problem. Our remaining problems is fixing the automated damping.

So now we're going through, by hand, and checking that either the modes are damped with what's reported in the violin mode table, or recording the difference. So far we've found three modes that are different:
  IY MODE3 501.749 FM1 4     -5G
  IY MODE6 503.120 FM1 3 4   +200G
  EX MODE7 507.194 FM1 4     -50G

Jenne has programed these new settings into the guardian and loaded it. THESE HAVE NOT YET BEEN UPDATED IN THE VIOLIN MODE TABLE.

However -- we recommend that the remainder of the night, and into the owl shift, be spent carefully turning on all 500 Hz damping filters, and either confirming that the violin mode table is right, or finding new settings (phases / signs). Be cautious with the gain for starters, with the settings as in the violin mode table, but be watching both spectra and control outputs. And BE PATIENT. Wait 5 minutes or so to see whether your change has done good. A lot of the troublesome modes are close together, so the beatnotes between close modes can be deceiving.