Firstly I had to decide which of the audio clips from their original rushes could be used without having to add in audio from other clips, I would have to do this as some of the audio files from the original rushes may have been contaminated by voices of the crew, wind disturbance, microphone failure (due to someone stepping on the external microphone cable or other) 
As you can see there is one blue bar (the video) and two green bars (the audio). There are two audio wave forms due to us filming with the general microphone that the Sony NX5 came with, and we also used an external microphone, a rifle mic. There are two audio channels incase there is a fault with one of the microphones during a shot, such as the possible reasons I stated earlier. The rifle mic is of a far better quality than the stock microphone and is more precise with what audio it picks up.
Finding the audio from one clip to put over a different clip is a difficult process, although you can get away with a lot, for example if I shot five takes of the sniper getting up and taking his rifle away with him, I could use audio from any of the four clips within reason, slowing them down, making them quieter etc. until the sound fits the video, I had to do this a lot as we were unlucky to get a fair few audio errors on some of the good shots that we actually wanted to use, which meant finding a lot of audio from other clips! 
As I was constantly using audio that cut in suddenly and sounded awful I had to find a way to soften the sound and make the transition less abrupt and noticeable. One easy way to do this was to have a constant ambient sound recording from the shoot day on a loop to underlay all the other audio, this was so I could easily cut in and out of different sections of audio without making it sound unprofessional and obvious. However the sound transition was still a little abrupt, so I fixed it by using a constant power on the audio channel. A constant power is effectively a Cross fade for audio. I did this by selecting the effects window and then opening the audio transition folder which gave me the option to add a constant power to whatever audio clip I wanted, so I dragged the effect to all the different clips I needed to, including all of the ambient sound channels as it would be very obvious if they suddenly cut to the beginning of the clip. The constant power faded the audio into one another which was really helpful for me and made the sound flow seamlessly. 
A lot of the time I had to adjust the level of the sound for each individual clip, this meant that I had to keyframe the audio and adjust the decibels of the clip. This key framing process is very similar to key framing video. You simply click on the clip you wish to edit, go on to the effects tab and the screen on the right should open up.
Once you're ready, you click on the stopwatch tool again which starts the key framing, you can then adjust the decibels at whatever intervals you choose throughout the clip and premiere will automatically adjust the sound between the key frames of audio.
As for the soundtrack to our thriller, we looked on a royalty free music website called purple planet music, we looked through all the tracks on the website and found a soundcloud account that gave a list of their posts, all soundtracks and most of them with eery and thriller like soundtracks. 
We found a track called "The Abyss" which we downloaded and used in our Thriller throughout, we cut it up and adjusted the volumes of each snippet, and we overlapped the clips toc reate an aggressive rumbling noise which assisted in the building of the tension.
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