Making two different patches sound correct

[Timo]

Do you have examples of your own problem? Because pitching issues are completely different to what you are referring to in the MP3 you gave. The latter is more about song arrangement and mixing techniques (EQ, patch selection, etc,), while you're discussing intonation problems.

On the Virus, with regards to fine-tuning, Oscillator 1 is always a fixed pitch, while Oscillator 2 detunes in a positive fashion, so if Oscillator 2 is detuned a lot the average pitch between the two oscillators is skewed upwards (slightly sharp), unless you use Oscillator 3 to detune in a negative fashion to bring the average pitch back to the same as the original Oscillator 1.

So beware of this when mixing two patches, say if you're mixing one patch that uses just one oscillator, and another patch with two oscillators that are heavily detuned.
I have to watch this especially when mixing Virus patches with my other synths, as I don't use Oscillator 3 unless I have to (to use less polyphony), so the Virus patches tend to be nearly always skewed upwards (sharp) compared with other synths.

Personally I would prefer it if Oscillator 1 allowed fine detuning, so if you were using two oscillators you could balance the average pitch between the two (say Osc1 = -20, Osc2 = +20..... As opposed to Osc1 = 0, Osc2 = 40, to obtain the same effect, as the latter would skew the pitch of the whole patch by +20 cents.)