Paul,

There is no tempo information in .wav files. The 120 BPM is a default BPM for most DAW software like Studio One.

Your song tempo is whatever it was when you created it, which sounds like it is 105 bpm.

You are going to have a bit of trouble getting MIDI in Studio One to match imported .wav unless you have some distinct count-off which you can trim to in Studio One, and after that is done, then set the tempo in Studio One to 105 bpm.

The bottom line is the .wav files that you imported into Studio One contain no timing information whatsoever. They are not DAW project files which would contain tempo but would be unrecognizable by a different DAW host.

If your BIAB project is basically just midi, and not using real band or any other real audio files, then you should be able to export the MIDI for each track and import that into Studio One, and then use Studio One to contain both the midi output from BIAB, as well as the MIDI from the EZ software, and point the various MIDI tracks in Studio One to the appropriate VSTi.

You must have a higher end version of Studio One, because the base/artist version will not host non-PreSonus VST/VSTi.