Yes, the audiologist worked on the SmartFit, I was watching her setting up the device, and then I installed Smart 3D and she explained how to use it. A while ago I went to ReSound local website and they show in a video that you can set up Noise Reduction in the Smart 3D software, but it is missing in my app. I cannot set up noise reduction level at all. So you think it makes sense that ReSound Key 4 cannot play higher frequencies without distortion? Then I would definitely go for something higher in their model range.