Introduction
What is Waves Tune doing? This article will not cover how to use Waves Tune, but to determine what corrections Waves Tune makes to perfect pitch music, when the user adjusts the knobs.
Inputs
A pitch perfect tone of 440Hz is used to determine the changes made by Waves Tune, rather than complex voice recordings.
User Adjustments
In this test, the goal is to determine what the following knobs do:
- Speed - this knob ranges from 0 to 800ms
- Note transition - this knob ranges from 0 to 800ms
- Correction - this knob ranges from 0 to 100%
Waves Tune Scans a Perfect Pitch
The input tone is a 440Hz sine wave. It has no need for tuning. The tone is loaded as a single line in the middle of the band. As expected, this corresponds to the A note.
The knobs are at the factory default settings. What happens if Speed, Transition or Correction knobs are varied?
The settings are:
- Speed : any setting
- Transition : any setting
- Correction : any setting%
Nothing changes, and this is to be expected, since the perfect pitch needs no corrections.
Tuning A to B♭
What happens if 440Hz is moved to B♭, or about 466Hz?
The settings are:
- Speed : 0ms
- Transition : 0ms
- Correction : 100%
With no delays from speed and transition, the output is a fully corrected straight line in the middle of the B♭ band.
What will happen if Note transition is delayed?
The settings are:
- Speed : 0ms
- Transition : 50ms
- Correction : 100%
With note transition at 50ms, the output climbs to B♭ after an interval. Presumably, it reaches 70% of correction after 50ms.
What happens when Note transition is delayed to 100ms?
The settings are:
- Speed : 0ms
- Transition : 100ms
- Correction : 100%
With note transition at 100ms, the output climbs to B♭ after a longer interval. Presumably, it reaches 70% of correction after 100ms.
What happens when Note transition is delayed to 800ms?
The settings are:
- Speed : 0ms
- Transition : 800ms
- Correction : 100%
With note transition at 800ms, the output never made it to B♭. Presumably, it reaches 70% of correction after 800ms.
What happens when Speed is delayed to 100ms?
The settings are:
- Speed : 100ms
- Transition : 800ms
- Correction : 100%
Speed adjustment has no apparent effect. Presumably, there is nothing at the beginning of the tone to adjust, as Waves Tune moves the tone from A to B♭.
What happens when Correction is varied? For this test, Transition will be maintained at 100ms, while Correction is varied from 100% to 0.
The settings are:
- Speed : 0ms
- Transition : 100ms
- Correction : 100%
As before, Waves Tune moves the A tone to B♭ with a time constant of 100ms.
The settings are:
- Speed : 0ms
- Transition : 100ms
- Correction : 50%
At 50% Correction, Waves Tune begins correcting the A tone from 453Hz (between A and B♭) to B♭. It may be inferred that 50% correction means start halfway between the original frequency and the desired frequency.
The settings are:
- Speed : 0ms
- Transition : 100ms
- Correction : 25%
At 25% Correction, Waves Tune begins correcting the A tone from 459Hz (25% to B♭) to B♭. It may be inferred that 25% correction means start ¾ from the original frequency and the desired frequency.
The settings are:
- Speed : 0ms
- Transition : 100ms
- Correction : 0%
At 0% Correction, the A tone is immediately corrected to B♭.
Inferences
What can be inferred from correcting A note to B♭?
- The Speed knob does not affect anything in this test.
- The Transition knob determines when the correction reaches , or 70% of the desired frequency.
- The Correction knob determines the amount of slide from the original tone to the desired tone. 0 means no slide, 100% means full slide.
Conclusions
- During the initial scan made by Waves Tune, it has nothing to adjust because the input is already pitch perfect.
- The Speed, Transition and Correction knobs also have nothing to do.
- If the tone is moved completely out of its A note band,
- The Speed knob has no effect.
- the Transition knob controls how soon the output reaches 70% of the desired frequency.
- the Correction knob controls how much slide from the original frequency to the desired frequency, ending at the desired frequency.
