Changes made in Logic Pro 10.4.5 and 10.4.6 unfortunately prevent the ability to write automation data for parameters with discrete (non-numerical) values via control changes in the plug-in's interface during playback. This issue affects Auto-Tune® Access, Auto-Tune EFX+, and Auto-Tune Artist.
Fortunately, Apple resolved this issue in the Logic Pro 10.4.7 update, so please make sure you've installed this version (or later) of Logic to avoid this issue.
For example, if you engage Write, Touch, or Latch automation mode and change the Key or Scale parameters during playback, no automation data is recorded to the track. But parameters with continuous numerical values (e.g. Retune Speed) are not affected by this issue, and all parameters can read previously recorded automation data during playback.
• All parameters with discrete non-numerical values controlled via drop-down menus and buttons (Key, Scale, Formant, etc.)
• Install the Logic Pro 10.4.7 update (or later versions).