Effect plugin to change pitch

[Michael Willis]

I'm looking for an effect plugin that will change the pitch of the input sound by some ratio without speeding or slowing the sound. For example, I want to try recording an acoustic instrument and then try making the plugin tune it up an octave or down an octave, or maybe transpose it into an arbitrary key.

[finotti]

Although I am sure there is some plugin that does it, I've done it in the past by simply copying the audio file to a new track and using some Ardour built in function to change the pitch. It doesn't work "live", but it works well on recordings.

[CrocoDuck]

I remember Rakarrack having exactly that: http://rakarrack.sourceforge.net/dl.html. I am not sure what the state of the project is.

[lilith]

https://x42-plugins.com/x42/x42-autotune

[bluebell]

I'm looking for an effect plugin that will change the pitch of the input sound by some ratio without speeding or slowing the sound. For example, I want to try recording an acoustic instrument and then try making the plugin tune it up an octave or down an octave, or maybe transpose it into an arbitrary key.

"AM Pitch Shifter" (LADSPA) does a good job. Of course it doesn't keep the formants like Melodyne does so you get a Mickey Mouse effect if you use large intervals. It's part of the "swh-plugins" package.

Works fine in my songs to add slightly detuned voice tracks and in a combination with Carla and Linphone to give me a Darth Vader voice in a phone conference call.

[rghvdberg]

rubberband pitchshifter has ladspa a ladspa plugin and does exactly what you need.

[tramp]

GxDetune.lv2 from guitarix could shift on octave up/down, and could as well detune by some (12) cents.
It has a latency indicator so that you could easily compensate the delay from the shifted signal, it has separate wet dry controls and could as well internal compensate the delay from dry to wet. Additional it has a 4band EQ to fine tune the shifted signal.

[ssj71]

if it's monophonic, the infamous e-wham is designed for that (any detune amount from -3 octaves to +2 octaves). Falls right over if you play chords though.
https://github.com/ssj71/infamousPlugin ... /src/ewham

It doesn't preserve formants though so it will give the chipmunk effect to voice, but is fine for something like guitar. rubberband is my recommended one if its for voice.

[TobeDowns]

Hello...I'm utilizing Audacity editorial manager, it alright for most things, however in the event that I attempt to pitch change a wav test of vocal from D down to G, its excessively low a sound against other vocal examples in a similar pack I'm utilizing( not all the packs vocals are in a similar key).

pcb assembly quote

[ycollette]

And you also have mod-pitchshifter:

https://github.com/moddevices/mod-pitchshifter

This repo comes with various plugins like
- a capodastre to tune above and below the current tuning of a guitar.

There are a lot of interesting plugins ...

I tested one plugin of this repo in this video:
https://www.youtube.com/watch?v=BmFr9y0ItvQ

[sjaehn]

I guess Michael was looking for an algorithm (although he asked for a plugin). The majority of pitch shifters use a granular approach:
Step 1: granulize (= cut the input signal stream into blocks of something like samplerate / lower_frequency_limit samples
Step 2: time-stretch the grains from step 1.
Step 3: combine the stretched grains

Step 3 is the critical one.
Problem A: If the stretch factor is lower than 1.0 (pitch up), you will get gaps. This means you have to fill the gaps with a copy of the grain.
Problem B: if the stretch factor is different from 1.0, direct combination of the grains will result in a hard jump. And thus in a click.

There are two major approaches to solve these problems:
Solution i: crossfading
Solution ii: alignment

Solution i may result in serious quality problems, especially with synthesizers. Solution ii is hungry for CPU speed.

If I test pitch shifting algorithms, I always take along a sine wave and a white noise as input signals. A good pitch shifter will keep the sine wave as a sine wave and only changes its frequency. And about white noise? In theory, you can't change pitch of white noise (unless stretch_factor * samplerate come into the hearing range). And thus, a good pitch shifter shouldn't be able to change the pitch of white noise. Pitch shifters based on solution i fail in both tests.

[Basslint]

And you also have mod-pitchshifter:

https://github.com/moddevices/mod-pitchshifter

This repo comes with various plugins like
- a capodastre to tune above and below the current tuning of a guitar.

There are a lot of interesting plugins ...

I tested one plugin of this repo in this video:
https://www.youtube.com/watch?v=BmFr9y0ItvQ

Sad that MOD has abandoned FLOSS licenses, from what it seems...

[ycollette]

Yes, there are not so much activity on the mod-device repository. Sad ...