Add a Transpose / Pitch shift effect

[mixxxbot]

Reported by: rryan
Date: 2014-03-28T14:38:44Z
Status: Fix Committed
Importance: Wishlist
Launchpad Issue: lp1299035
Tags: effects, hackathon

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We should package up RubberBand as a transpose effect for pitch shifting.

http://en.wikipedia.org/wiki/Transposition_(music)

[mixxxbot]

Commented by: rryan
Date: 2014-11-20T20:55:22Z

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Kicking to 1.13.0 unless there is a candidate for 1.12.0 that emerges soon!

This would be an easy weekend bug for someone to get ramped up (hint hint).

[mixxxbot]

Commented by: daschuer
Date: 2014-12-09T18:55:58Z

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This can be also used to fix Bug #⁠1398299 "pitch knob is too coarse" by adding an additional pitch knob with finer or coarser scale.
This way we need no extra space in The GUI and controlling by Controllers with effect region is possible as well.

We have also not found a place for the helpful sync_key control. This can be also made accessible from an effect Rack.

In a later version, we may also add additional harmonic mixing controls, described here:
http://www.mixshare.com/wiki/doku.php?id=mixing_harmonically

I am thinking about an COs only implementation that just, passes values to the normal deck scaler. This way it will not consume much extra CPU.

For channels without a scaler, we may add a own scaler instance inside the effect.

Anny thoughts?

[mixxxbot]

Commented by: esbrandt
Date: 2014-12-09T19:52:55Z

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On Dec 9, 2014, at 7:55 PM, Daniel Schürmann wrote:

We have also not found a place for the helpful sync_key control.

What does this exactly?
See my questions in https://bugs.launchpad.net/mixxx/+bug/1300616

We`ll find a place in the skins.

[mixxxbot]

Commented by: Pegasus-RPG
Date: 2014-12-09T23:56:05Z

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Doesn't this duplicate having a pitch/key knob? What's the use case for having it as a separate effect?

[mixxxbot]

Commented by: daschuer
Date: 2014-12-10T07:21:54Z

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For the harmonic mixing use case, we need a control, that is able to tweak < 10 cts. The nearest harmonic key is always <= 2.5 
way. So from this point of view, a 0,05 ct click and +- 3,2 halftones knob should be sufficient.   
For a chipmunk effect, the current +- 12 halftones scale is just fine. 

So we may decide to use the fine scale on a permanent knob and move the coarse knob to an effect Rack. We may also duplicate the fine knob for users who wish to have a shared FX/Pitch knob on the controller.  
This will also reduce the need for a pitch knob in all skins. 

We may also implement a two buttons to shift a track by 5 halftones Up and down (or other fixed jumps). This allows to produce cool chord effects during mixing.

[mixxxbot]

Commented by: Be-ing
Date: 2017-01-28T00:38:00Z

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Doesn't this duplicate having a pitch/key knob? What's the use case for having it as a separate effect?

I am not aware of any controller that has a dedicated key knob, but plenty of controllers have effects controls.

[mixxxbot]

Commented by: Be-ing
Date: 2017-11-11T14:36:36Z

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There has been no progress on this lately, so I am removing the 2.1.0 milestone.

[mixxxbot]

Commented by: Be-ing
Date: 2017-12-28T02:24:59Z

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Any volunteers to take this up for 2.2? I had thought about implementing this as a hack that controls the input channel's key knob to save CPU use, but that would only work if the pitch shifting effect was loaded in the first spot in the chain.

[mixxxbot]

Commented by: daschuer
Date: 2017-12-28T09:37:40Z

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An other use case could be a tempo locked key wobbling, like auto tune effect.

[mixxxbot]

Commented by: Be-ing
Date: 2017-12-28T13:43:33Z

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That is a cool idea!

[mixxxbot]

Commented by: davidchocholaty
Date: 2022-05-30T16:08:49Z

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The independent pitch shift effect feature will be implemented as a part of the Google Summer of Code 2022 project.

[mixxxbot]

Commented by: daschuer
Date: 2022-05-31T21:13:13Z

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#4775

[mixxxbot]

Issue closed with status Fix Committed.