Hi Pauline, yes they still give the same effect. The issue with youtube is that when you convert videos to mp3s, the audio compression tends to mess with the frequencies sometimes. So, the fields embedded in the frequencies may not work to their full capacity when downloaded off of youtube hence why we have some of the audios in our store in their original mp3 format. But, you can still try it! Some people have downloaded our audios off of youtube and still reported getting good results after download them. But others have not unfortunately.