Try putting your audios on 'start of layout, then add the event 'trigger once when true, that way it wont keep preloading, also I dont think you need the 'or' time greater than 5seconds, just let them preload first, just a thought.
Also there is many audio editing programs out there, if you get a good 20secs of audio without the voice you can make it into a loop sound flawlessly,
save yourself a few of those folding kinda money :)