Why I didn't used Garage Band

For my AS coursework I made my own soundtrack on Garage Band. I didn't use it this year as I feel it has very limited sounds and none of them really fit with the mood of my trailer (creepy/scary). Garage Band also only has very short sounds that don't work on there own, you have to build sounds on top of each other for it to sound good. This would take a long time that might be wasted if my audience feedback was to suggest to change the soundtrack. I feel Garage Band is useful for making songs and sometimes film soundtracks but not a trailer. Trailer soundtracks have to be epic to draw a audience in I believe that Garage Band will not offer me the sounds I want. So I will be getting my full soundtrack from a website.