Lesson Help On Doubling And Detuning

Solved

Hi, just a little curious about the lesson on detuning. In the lesson you said if you detune one oscillator one way you must detune the other oscillator the same amount the other way or it will sound out of tune. What about synths that only let you detune one oscillator, the moog minitaur or sub 37 for instance, they only let you detune oscillator 2.
Many thanks.