@Max Arwood Thanks for your tutorial, but I think you misunderstood ... I don't mean to adjust some parts' pictches of a long audio.
What I want is: For instance, I have a pretty short audio clip which is just 0.5 seconds long and it sounds like "DING". Now use it as an instrument to form a song (by creating many copies of DINGs and change the pictch of each of them): DING(c) DING(e) DING(e) DING(d) DING(e) DING(c), something like that.
@slartabartfast Thanks for replying and I got it! What I need is just a sampler. I choose sforzando by PLOGUE and it works well.