It might only play from the start though but at least you wouldn't have to use Fruity Granulizer. Instead of using Fruity Granulizer, I think you can just go to recorded audio in the browser and find your acapella and drag it to the piano roll. Go back to the SMP page and make sure 'resample' is set to 'none' then right click Pitch and press 'reset', right click 'mul' and press reset, right click 'time' and press 'reset.' (Without bouncing the audio)Are you sure your pitch is still rising after changing the time stretching settings? The pitch is constant on mine. This is all fun and good except I'm working with a full acapella, is there a way I can accomplish this without having to go all the way back to the beginning of the piano roll clip to have to trigger the sample? It also limits the editing process. So after doing some reasearch I learned I can fix this with Fruity Granulizer which is a pretty rad plugin where you can lock your sample on a piano roll. This includes, but is not limited to BPM warping (manual and automatic), easy automation of any control parameters across a whole host of hardware and software.

After completing your steps, I also realized that even though my beats are locked, the pitch of this sample kept rising. Thank you guys so much! One more question though, and it may be a little hard for me to explain but ill do my best.

Fl studio tempo automation