[Timo]

If you're using one simple oscillator, you don't need to worry about pitching problems whatsoever (unless it's being modulated elsewhere in some wierd fashion).

If you have two simple oscillators that are detuned from each other, the 'perceived' (average) pitch you'd 'hear' would lie directly in the middle of them.

So if you had Osc1 fixed at 0, and Osc2 detuned at a value of +40, the average perceived pitch would be in the middle of those two = +20.

Unfortunately because Osc1's fine-tuning is fixed, you can't re-balance any pitch offset when using Osc2 too. So when you're building some of the more detuned patches, for trance maybe, the average pitch can easily be skewed upwards a touch, making it sound sharp, and certainly way off pitch when played against another synth.

I was wrong to say 20cents, as the values on the detune knob are unrelated to real-world pitch. One full rotation (+127 values) of the Osc2 detune knob actually pitches Osc2 up by 50 cents (real world). Osc3 can pitch downwards 50 cents.

If you used all three oscillators, Osc1 at 0, Osc2 at a value of +30, and Osc3 at -30, the average pitch would be 0 as they balance each other out.

I think I may well missing what you're actually after, though....

In what way do your patch's tones "sound off", when combined? Are you actually talking about pitch? Or do you mean something else, such as in terms of occupying too-similar areas of the frequency spectrum, volume, panning, effects, etc.? What sort of patches are you attempting to combine?