I've quantified the changes that will take place in the GDS calibration correction filters when the ER8/O1 update occurs. A summary of the changes are:

• Actuation time delay update causes about 6 degrees of change in the phase accross 1 kHz
• Updates to the analog AA/AI filters cause < 5% change amplitude across all freqeuncies and about 7 degrees of change in phase across 8kHz
• Removal of ESD low-noise-low-voltage driver pole correction removes < 0.1% change in amplitude, mostly at high frequencies and about 2.5 degrees in phase across 1kHz
• Uncompensated OMC whitening poles update causes ~25% change in amplitude across 8kHz and ~60 degree change in phase across 8kHz.

In total: 

• The residual correction filter updates cause 16% change in amplitude and 50 degree change in phase across 8 kHz.
• The control correction filter updates cause <1% change in amplitude and 2.5 degree change in phase across 1 kHz 

The attached plots illustrate the changes described above.