In free mode, ratio CV becomes a volt per octave control. This allows each of the 4 oscillators to be operated independently. This is the intended purpose of free mode. I’m not follow–what is it you’re hoping free mode would do that’s not possible in lock mode? Or maybe put another way, what is your intended use case or result?
If you like to track master coarse and fine and master “1v / oct”, there is of course lock mode. If you want to change to a relative tuning, you have ratio (which works in integer steps in lock mode) as well as detune allowing for inharmonic timbres. Those detune amounts range ± 6 semitones, which offers you the full range of tunings as you step through different ratio values.