Question about HS Cookbook for Bazille

[Scrubbing Monkeys]

In the patch Additive Waves tutorial-second exercise. It asks to use the harmonics 5,6,10,12,15. Then suggests that due to the lowest harmonic being a 5, the Osc needs to be retuned. However without retuning......a C is a C and if I follow the tuniing offset I get a G#. Am I missing something here?

[Viktor [TUC]]

That part of the description is for when you start from scratch with an initialized patch.
It's basically what was done in that Additive Waves patch. If you look at OSC1, it's set to a tuning of 8.14, that's exactly retuned value that the description suggests. The fifth harmonic, which is the base of the tone as described in that chapter (built from harmonics 5,6,10,12 and 15), is a major third above the fundamental, but minus 14 cent, hence the advice to retune.

Viktor

[Chris-S]

By shifting the base note you can simulate chords with the harmonic series. Also for chord-like wavetables this trick is used (for example in Massive).

[Scrubbing Monkeys]

That part of the description is for when you start from scratch with an initialized patch.
It's basically what was done in that Additive Waves patch. If you look at OSC1, it's set to a tuning of 8.14, that's exactly retuned value that the description suggests. The fifth harmonic, which is the base of the tone as described in that chapter (built from harmonics 5,6,10,12 and 15), is a major third above the fundamental, but minus 14 cent, hence the advice to retune.

Viktor

Hey Viktor thanks for the reply. I will dig in a bit further this eve. My initial thought was that the 8.14 offset was to bring it back in tune. If I isolate Osc1 it is G# when I press C. Which maybe what you are trying to explain to me but the light bulb hasnt come on yet.

Cheers

[Scrubbing Monkeys]

By shifting the base note you can simulate chords with the harmonic series. Also for chord-like wavetables this trick is used (for example in Massive).

Ah so Osc1 being shifted may be intentional and i am hung up on wanting the offset to bring it in to tune.

[Viktor [TUC]]

It's easier to understand if you follow the instructions from the cookbook directly and try it out. When you do that, you'll immediately hear why you need to retune the oscillator. Retuning it will bring it back to the original root note.

Using the 5th harmonic as the lowest harmonic, with nothing below it, means there's no original fundamental frequency. The 5th harmonic is now the lowest frequency, and the 5th harmonic (in the harmonic series) is 2 octaves and almost 4 semitones higher than the first harmonic (the original fundamental frequency).
But if that 5th harmonic is now what you hear when you press a note, you'll notice it sounds almost 4 semitones higher than what you'd expect. So in order to bring it back to what the original fundamental frequency was (or any octave of that), you need to retune it down by almost 4 semitones. Hence the suggestion in the Cookbook to start with a semitone setting of 12 and go down by almost 4 semitones, to 8.14.

Viktor

[Scrubbing Monkeys]

Hey Victor
The issue that was throwing me
Off is that combination of tones in that minor triad was causing Reatune to show G# when pressing C.That is a direct result of the 6th harmonic . So this is a great case for using your ears not what you see. Tuners dont always interpret chords very well.

Thanks