@danoise can you you say something regarding the issue with the cents in the renoise sampler? So whether 127 or 100 are a full semitone? My research points toward 127, but not sure at all right now, or how to test such a small difference...
Edit: forget about it, one semitone is 127 finetuning steps in renoise, I was right with my assumption. Just when you're too tired to layer 2 sines tuned in a certain way to see how they behave.....
The importance of precise tuning can be seen for example with the ring mod in renoise. I just made a wavecycle 168 @ 44100. It was slightly out of tune with the ringmod, resulting in slow phasing. The I fired my lua calculations, and found out that it spat out something like this:
>>> print( freqtonote(44100.0/168.0) )
C-4 + 5.7766788345916c / + 7.3363821199313Rc
So it seemed like it was a good idea to do the inverse offset and tune the sample down by 7 cents. Tadaa - Rinmod phasing gone, or at least too slow to be noticed any more. The 0.33 cent is a detune much to small to be noticed by ear. The "c" number is base 100 cents, the "Rc" ("Renoise cents") calcs with cents being 127 for a semitone.
Well equal temperament is a compromise and will always generate slight phasing for anything else than same note or octaves. But, despite of this, tuning 2 different instruments perfectly to each other will keep their harmonic interaction and beatings between them at a very consistent niveau. I think you can hear the difference, though I have to say that wild detuning also has its place, even a more musical than perfect tuning, both have their reasons.
The cool thing about multisamples is you get rid of aliasing in high pitched notes. If you do the multisamples right, that is, so lowpass filtering above the audible range for the target pitch, is much more effective than the "aa" button renoise brings. Of course octave bends can sabotage this, but still the results will be superior.
Other than that when it comes to aliasing I always render my stuff @ 192k, and I learned to watch out with heavily distorted instruments to do a 192k test render while designing them, to see if the aliasing changes the sound too much. For example the renoise "saw_c1" is a Mistviech because of the silly gibbs ringing that is of no use but to create aliasing, but hitting the smooth button 3-4 times rolling the gibbs ringing off will fix that sample.
Edited by OopsIFly, 14 September 2017 - 15:30.