Hi Nigel: I just came across your post. I think we may be having some of the same problems. I have a E4000 tuner as well. I have had a station online for about a year, but when I upgraded software a few days ago I found my waterfall levels had gone way down. I tried using CubicSDR to find a tuner setting but had issues as well. You can see my posts near the bottom of this thread:
Hi @vk5qi - Do you think an update to the E4000 driver is in the near future? Ideally I want to be able to control the E4000 LNA gain manually, but I would like the 6 IF gains to be automatically controlled (I think the chip allows that, and it seems like it would be hard to get that many stages optimized). If not, I will start down the path of a lot of playing…
Thanks
Graem