The OMC whitening chassis has been modified (42361) so that the second whitening stage is now a low pass filter.  The idea is that we can engage this if the violin modes get rung up so badly that we need to reduce the analog gain to avoid commissioning. Jeff K installed the compensation filters yesterday, and now I have modified the OMC_LOCK guardian so that it can be used to engage this low pass or remove it, and so that the add and remove whitening states will only change the stages that are still whitening stages. 

I've tested this without the OMC locked and it works, but it would be a good idea to test it with the OMC locked before trying it at DC readout to make sure everything is OK with the filter and it's compensation.