Soundtrack Needs to be Lengthened - How

I converted a 1080i video to 24P and need to bring the soundtrack aiff file into sync by slowing it down 4%.
I searched the forum and tried every suggestion with no success.
The aiff file is 9m:00 seconds, and it needs to be 9:18.
I bring it into ST, and double click on the aiff file to open it in waveform editor. Drag across the file, elect the tool, and try to pull to the right.
It won't move.
Then add about twenty seconds of silence, and reimport.
Same thing.
Even when I get to move a little, the original aiff file and this new one in the wave editor do change in length, nor can I export anything at the right length.
All that is created is another ST file in my source folder, but that is the same length as the original one.
Read the manual, this board and I'm lost.

Not sure but...
Have you checked your Sync Preferences?
The conversion may have placed some timecode in there.
You can either add seconds there or you might try Time Stretching from the Process Menu.

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