Prevent Storyline 360 from normalizing audio volume

Good afternoon,

I'm working on a training where the learner has to rank sounds based on intensity/loudness and pitch/tone, and when I publish the training, the sounds all seem to be normalized. There is not much difference between the sounds, and it's not working the way it was designed to work. I have NOT checked the box to optimize sounds, and I've attempted to change the volume of the sounds using the audio settings in Storyline, but it's still altering the volume of the sounds to make two of them almost indistinguishable in terms of intensity/loudness. Does anyone have any suggestions for how to deal with this?

Thank you,

Julia