Hi Charles welcome,
I'm not quite sure what you mean by "i see no mp3 files for playing ?".
Do you mean in the main window or when programming a format in the format planner.
I take it that you put some mp3 files in the appropriate format folders to create a format and selected the main folder where your audio library is located, in the setup.
It should look likes this
HomeFolder/
Audio/
With sub folders
Music/
And these are the formats you name, where you put your audio files.
old/
new/
classics/
Jinlges/
Create your jingle formats here.
Messages/
Others/
Best,
Corb