Not exactly sure what you mean when you say ‘extend’? Do you mean that the end of the sample matches the length of other parts but the content is exactly the same? So it still contains the 8 second content? So you will have 7 seconds of silence at the end. Or do you want to fill it up with a copy of the original content so the it will actually sounds for 15 seconds?
Sorry but not too familiar with FL Studio. But I suppose you could just copy the part by dragging it from the middel at the end of the part and clue them together? That would preserve everything as it was before but now it’s twice as long.
No, you can just copy the entire part by clicking at the end and drag it to the right. You then have an exact copy of the part and now you can glue it together if you wish. So now you have a part of 16 seconds. It’s only 2 clicks.
I think people were trying to offer alternatives because you had specifically said it wan’t timestretch. There would be no point in doing this for this use case any other way than sizing applies timestretch.
I think you’re expecting something to happen that is totally impossible. In that video as far as I can see he imports a file and then he makes it longer to fit the space. This is what the method I gave you will do in exactly the same way.
If you stretch a sample to a different length of course the BPM MUST change, it is the laws of physics.
You can’t make a sample that fits BPM longer and still fit the BPM (excepting if you exactly double the length so it plays half time.)