If Alchemy's controls feel unresponsive when you first open it, try changing your display's color profile setting.
- Choose Apple () menu > System Preferences > Displays.
- Click the Color button, note the currently selected profile in the list on the left, then choose "sRGB IEC61966-2.1" from the list.
- Close the System Preferences.
When you are done working with Logic Pro, repeat the above steps and choose the previously active display profile for your display.
Apple is looking into additional solutions.