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Greetings, I have an HD500 that I purchased in 2012. I also have a Variax. I use the two together, with the Variax Ethernet cable. At the end of 2015 I updated the firmware on both the Variax and the HD500 to the latest and greatest at that time. I have most of my patches set to also select specific Variax models, including custom tuned models that I created. Everything was working GREAT until yesterday. As a fully immersed computer scientist with an electrical engineering degree as well, it would be strange to hear anyone suggest upgrading the firmware yet again from a configuration that was working fine for over a year. Hopefully, someone has knowledge of the root cause of the following problem, and we won’t need to travel the path of “spray and prayâ€. At this time, I have about 40 patches that work flawlessly. But 3 patches have begun some odd behavior. All three are basic, clean sounds; a noise gate, a red comp, a clean amp with maybe a slight bit of modulation and reverb on the back end. Each patch selects either the Variax banjo, sitar, or a custom tuning. The problem now is that all three of these patches (and only these specific three out of the 40 patches I have programmed) are now dead silent when foot selected. They were working fine a week ago. Since that time, I only made some output balance adjustments between some of the other 40 patches, and not these. If I’m in the POD HD500 Edit app on my desktop, with the HD500 connected via USB, I can load these dead-silent patches to the HD500 from the app and they come alive and sound fine. I can do a “save†on the HD500, and they still play. But as soon as I select another footswitch patch, and try to come back to these problematic patches, they are once again silent. I can even “push†the sound from the POD HD500 Edit, have it come alive and be playing, hit save on the HD500, push the same footswitch assigned to that patch, and it goes dead silent. I have tried a “restore†of sorts by loading saved bundles from 3 and 4 weeks ago. Same problem. I have tried rebooting the 500 (power cycling) --- same problem. I can bring up any working patch, and manually select (on the variax) the banjo, sitar, and custom tuning, and they play fine. Those settings on the Variax are alive and well. WTF, BBQ?!?