Paul has let the cat out of the bag (http://www.psaudio.com/forum/bhk-power-and-preamp-forum/preamp-stacking/#p80737):
"Some of the noise problems people have experienced with DSJ are about at an end. The latest release of firmware, called Redcloud, will fix the noise issues some have experienced with DSJ. Not only that but of course, Ted’s spun his magic web over this latest release (for both DSJ and DS) and it sounds utterly amazing.
Can’t wait to have you experience Redcloud. Expect to see a release in about two weeks."
I’ll give you a preview of the next release of the FPGA code in Redcloud (I’ll leave it to Paul and others to talk about other parts of the Redcloud release.)
Redcloud continues the work done for Huron. Huron had a few rough edges that were especially apparent on the DS Jr at lower volume levels. It turns out that they were always there but were more exposed in Huron than previous releases. A few DS Sr users noticed them as well.
Redcloud features much whiter background noise: this should greatly help those who listen at lower volume levels. The system’s analog background noise floor hasn’t changed (that would require a change in the hardware) but the cause of the digital noise floor being colored differently with each release has been fixed, this also lowers THD at all signal levels less than -10dBFS (i.e. almost everything you’ll listen to.)
With this change some of the less effective ameliorations for low level noise/distortion have been removed. This should firm up the bass, lower THD, lessen distortion at very high levels (> 3dBFS) and overall be less hazy than previous releases. In particular the changes in the bass from Torreys to Huron were an adjustment of one of those anti distortion patches. Now the whole patch is gone with another improvement to the bass.
Huron fixed some clicks and pops for a few users, but I think that almost everyone noticed some slightly louder clicks and pops switching between PCM and DSD that weren’t there in previous releases.
Some of those clicks and pops during transitions from one format to another have been treated. A quick volume ramp down and then ramp up has been added at any change in sample rates, transition to/from PCM from/to DSD happens, or deemphasis being engaged or disengaged. Also a source of some small ticks going from DSD to PCM have been fixed.
Here’s a quote from one of the beta testers (used without permission ): “I think FPGA131 is as big a step from Huron as Huron was from Torreys. Voices etc are so focused now that I can decipher words that I couldn’t previously. This also means that bass is much more real with real attack.”
We didn’t do a public beta, but I invited a few customers that had noticed some of the above problems to check that I was addressing their concerns and their feedback was very helpful.