So I did this whole procedure on a completely stock solo. That’s an unheated pixhawk 2 cube that came with the Solo, normal Solo props, and the stock piece of junk GPS. It is currently 30 degrees and windy/gusty.
Without any of this filtering, the solo’s loiter/position hold was like a drunk that just left a bar and is waiting for a cab. It drifted randomly and was knocked around by the wind both laterally and and vertically. This is what most Solo users are used to without modifications. I flew around the farm a bit (again with no filtering, just plain normal flight) and it was about as usual and expected.
With the filtering configured as per Andy’s wiki directions, it’s like a completely different copter. When in loiter / position hold, it just parked itself in the sky and barely drifted at all. This made a huge difference in flight performance. I flew it around the farm and in the cold wind reaching ground speeds up to 30mph and frankly it was one of the nicest solo flights I can remember. It even sounds healthier, although I suppose I could be hearing what I want to hear there.
Here are the accel and gyro graphs. The first set is the pre-filter. The second set is the post-filtering. On this Solo, the motor noise was right smack at 200hz with the hover throttle at .26. There is an obvious harmonic at 400hz too. The frame resonance was at 98hz just like on my other one which I used the static notch on.
(note: my other Solo from earlier in this thread has the motor noise at 170hz, but that copter has different props and a CubeOrange, which I suspect accounts for that difference).