To manipulate a saved loop sample in one of Reason's sampling instruments, just import the audio file back into your project.
Create an NN-XT sampler in your Rack.
Open the Remote Editor and click Browse Sample.
Navigate to your exported sound file and select it to load it into your sampler (Figure 10.36).
Once the file is loaded into your sampler (Figure 10.38), you can use a sustained note in the sampler's Sequencer track to trigger the sample (Figure 10.39).