If your pitch is off by 8 chromatic steps and your tempo is doubled, this sounds like the difference between a sample rate of 48k and 96k. You may want to try changing the sample rate for the song that you are working on under Song>Song Setup>General. Normally, if the audio files were recorded in Studio One, this should not of happened to you if you were working with an Audiobox iOne. Studio One should give you a sample rate mismatch error message if the device has a different sample rate than that of the song. You will want to make sure that you have installed the latest driver and/or firmware for your Audiobox iOne from the following link:
You will also want to make sure that you are not running any other audio applications that could possibly change the sample rate of your audio device while recording, while Studio One is open.
When you import files into Studio One, they will be time-stretched if you have the option selected. If you do not want them to be timestretched, you will want to go into Song>Song Setup>General and uncheck the box that reads "Stretch Audio files to song tempo."
If Studio One is asking you to navigate to your files when you re-open a song, then you will want to go into Studio One>Options>Locations>User Data and check the box to "Ask to copy external files when saving song." This will affect new songs that are created, but will not affect older songs. For older songs, you will have to choose the option to copy the external files from the right-click menu in the pool that can be found in the Browser window.
If you run into a situation in which the wave file headers do not have the correct sample rate set on them, you can use a program called Audacity to update the header information for your wave files.
Here is a video that illustrates how to use Audiobend in Studio One.
If you need to transpose, speed up, or tune a file, these options can be found by right-clicking the waveform in Studio One.