Now with the new FL Studio 12.3 feature, the timestretching can be done in realtime, plus without any pitch alterations. By editing the Elastique parameter, the duration of the clip would change without affecting its pitch, but it would take a few seconds to adjust the timing before the new adjusted sound played in. Or you could use the Stretch mode on the audio clip properties.
The downside of this method was that if you compressed the audio, it would pitch it up, and if you stretched it out, it would be pitched down. Now what? You could choose each audio clip, assign the Resampling timestretch mode and stretch out your audio to match the project tempo.
