Issue with massive import of ogg speech files.

I tried to add to my game some speech files. I tried to use the "Import speech files" feature from the main menu of Visionaire editor.

I stored my ogg files in a folder. Each file is simply named with the id of the key corresponding to its dialogue string.

I set up all the required fields in the Import speech files screen and started the import procedure.

Visionaire-studio then hangs. The procedure never completes. I must force quit the application. This happens even if I import a few small files.

On the other hand, with the same settings in the import screen, if I import mp3 files, the procedure ends smoothly, with no errors or warnings.

In this case, however, if I run the game, or, if I play a simple file from the Visionaire editor, speech files are played at a very high speed and the voices sound like those of chipmunks.

Has anyone experienced the same problems?

Can anyone suggest how to solve these problems? 

I am using Visionaire 5.3.2 (build 1241) on macOS Ventura 13.4.1.

Thanks in advance,

David