Hang on I think you're confusing the directions of movement here.
- The roller on the right side of the controller, controls the speed of the gimbal TILT (up/down) when it's moving between the preset 1 and 2 buttons. That roller has absolutely no affect on any other aspect of movement other than up/down tilting between the preset buttons.
- The manual TILT (up/down) of the gimbal using the paddle on the left, which does not have a user adjustable rate. It varies up/down speed with you far you push the paddle. There is a hack to adjust the proportional rate, but it isn't a setting somewhere you can just change.
- PAN is turning the nose of the solo left and right (yaw movement). This is controlled by the left stick moving left and right. Push the stick left, the solo rotates left. The further you push the stick, the faster it turns.
- The camera pan turtle/rabbitt slider in the settings section of the app controls the maximum rate or turn, and how fast it accelerates the turn. This basically adjusts the proportional output of the left stick. So you can put it on turtle to prevent you from making super abrupt yaw movements. Or you can put it on rabbit if you want to be able to make really quick turns.
- During smart shots, it is really independent of all of the above. The onboard computer in the controller and solo is doing all the thinking and work, making nice smooth movements all by itself.
If I'm reading
@Mr GruntHunter's post correctly, I think he wants to slow the yaw movement down. So first thing is to make sure the camera pan slider is on full turtle. If that's not slow enough, there are some options, but none are easy user settings designed to be changed. You can further manually reduce the yaw parameters in tower. But those settings will be overwritten in short order every time you change something on the solo controller/app or reboot. The other option is changing the proportional output of the stick using SSH commands.