The sound files you create and save are exclusively stored on the microSD card located at the back of the instrument. If you reorganize these files from your computer, it is not necessary to synchronize the SD cards as long as you have not modified the WT, SF, and LFO folders on the microSD.
If you do modify the WT, SF, or LFO folders, synchronization is required. In this case, it is recommended to use the "All Erase & Copy" function from CARDS SYNC in the System menu, page 2. This function is the most efficient. It formats the microSD of each voice card and copies the WT, SF, and LFO data from the source microSD.
This process takes just over 10 minutes. After 20 minutes, waiting longer will not change anything: if the "please wait" message with a spinning wheel does not disappear, turn off The Pool, wait a few seconds, and turn it back on.
For autotune, the same applies; it lasts 3 minutes, no more. After the audible end of the process, if the "please wait" message with a spinning wheel does not disappear, turn off The Pool, wait a few seconds, and turn it back on. Check if all the cards are correctly tuned, and if necessary, repeat the autotune process. It is very important not to touch anything (keyboard, buttons, etc.) during this procedure.
Versions 1.32 and later should resolve the issue of the "please wait" message not disappearing.