Is there any default microphone preference setting to change voice for anonymity? If no what are the popular free app for Mac (Catalina)?

5 Answers 5


A Mac can change its own voice, like when it's reading a text file, but not your voice. One free software package that does what you want is MorphVox Jr. It can change a man's voice to a woman's and woman's to man. There are examples on the link I sent. This version is free. The full version is $40.

This link lists 5 top voice changing apps. They are Voxal Voice Changer, MorphVox, Voice Candy, Voice Changer Plus, and Voice Swap. You can read about them on the link.


Option 1

You cannot achieve this directly through System Preferences » Sound » Input. If you're looking for fleⅺbility, low cost (or free), maⅺmum variation, natural sound, and the ability to carry on a real-time conversation, consider using a digital audio workstation (DAW), with a combination of:

  1. Soundflower (free, routes audio)
  2. LineIn | SoundSource 3: (free, combines mic and audio sources)
  3. Audio production software/DAW
  4. Change voice. Some of the best effects to start with are:
    • Raise pitch
    • Stretch and pitch
    • Bend pitch
    • Distortion
    • Doppler Shift
    • Reverb
    • Modulation
    • Delay
    • Echo

Option 2

If you do not need to carry on a realtime conversation, you could write what you have to say and have Acrobat narrate it.

Save your script as a PDF. Setup QuickTime to record audio from your computer. Depending on your set up, you may need to install Soundflower to route your audio correctly. Start recording in QuickTime. Open Adobe Acrobat and press ++Y or click View » Read Out Loud » Activate Read Out Loud.

  • Is there any tutorial for combining all these tool you mentioned? I cannot adjust everything together. Thanks May 16, 2020 at 0:54
  • Here are some of the resources that were helpful to me.
    – ssent1
    Jun 25, 2020 at 19:42
  • Sorry about the delay @SazzadHissainKhan, please see below.
    – ssent1
    Jun 25, 2020 at 19:52


  1. Steps
  2. Install LineIn
  3. Install Soundflower
  4. 👍 Steps to Record Skype Calls (and any Mac audio) in QuickTime
  5. Configuration
  6. Workflow(s)

Note: If you have a Markdown text editor and previewer on your computer, you'll be able to use the local links. I'm a huge fan of Brett Terpstra's nvALT. BTW, a new version, nvUltra is coming soon.

If you are going to use a Markdown editor, remove the <pre> tags or copy the raw table data for them to render properly.

Install LineIn

  • ⤓ LineIn 2.3 for Mac
    • LineIn 2.3 will run (officially) on MacOS 10.7 – 10.12.
    • I'm sticking with Mojave (10.14.6). It runs flawless on my box.
    • If you're running 10.6 or earlier, checkout Legacy Software - Rogue Amoeba
    • LineIn a super-simple, but powerful utility
  • Just follow the download instructions.

These are my verbatim installation notes (edited and formatted for clarity).

It's not as bad as it looks. It was much easier using this as a checklist so that I didn't step over any important steps.

The file:///Application/app_name.app/ links will open or go to the specified software if it's installed in your Applications folder (or other respective default folder), located at the root level of your boot drive.

Install Soundflower

Inter-application Audio Driver

Soundflower is a virtual audio device that provides an easy and simple way for Max/MSP and other applications to send and receive audio to and from any other application. Running with very low latency and cpu usage, Soundflower allows each client application to use its usual buffer size.

Installing Soundflower

Run the Soundflower Installer.pkg. You will be asked for an administrator account password. One file, Soundflower.kext, will be installed in the Extensions Folder. The remainder of the supporting files will be installed to /Applications/Soundflower.

If you experience difficulty installing Soundflower, it is recommended that you run the Uninstall Soundflower applescript that is provided on the disk image.

Using Soundflower

Soundflower presents itself as one of two coreaudio devices. In most cases, you will want to use the 2-channel device. To send the output of one application to another, simply select Soundflower as the output device within the first application and Soundflower as the input device within the second application.

If an application does not allow you to specify audio devices, you can make Soundflower the default input or output device inside the Sound panel in the System Preferences, or with the Audio MIDI Setup utility application.

The 16-channel device is provided for more complex routing situations, and can be used with more than two applications simultaneously if the applications support audio routing to any channel, as Max/MSP does.

Note that Soundflower's audio channels represent a global audio space. If more than one application is sending its output to the same channel, the audio will be mixed. If you want an application to send and receive audio through Soundflower, (for instance using Max/MSP to manipulate and return another application's audio) you must send and receive the audio on different audio channels or a feedback loop will be created.

Example To send audio from iTunes to Max/MSP, open the System Preferences and select Soundflower (2ch) as the device for sound output inside the Sound panel. Then, inside** Max/MSP's DSP Status Window**, select Core Soundflower (2ch) as the input device. All output of iTunes should now be sent to Max/MSP's adc~ object.


If you are hearing clicks or breakups, try increasing the buffer size of both applications (set within each application).

Removing Soundflower

From an account with administrator privileges, double-click on the Uninstall Soundflower.scpt file. This will run an AppleScript, in which you will be asked for your password.

History The Soundflower Change Log is maintained online at: https://github.com/RogueAmoeba/Soundflower-Original/wiki &/or https://github.com/RogueAmoeba/Soundflower-Original/wiki/Change-Log A more detailed history can be found at: https://github.com/RogueAmoeba/Soundflower-Original/commits/master

👍 Steps to Record Skype Calls (and any Mac audio) in QuickTime

  1. In Skype - start playing audio (test via Echo123)
  2. In QuickTime - Type ⌃⌥⌘N for New Audio Recording - In the popup menu next to record button select Soundflower (2ch) as the input - Hit record!


  1. Open Audio MIDI Setup
  2. Hit the + button in the bottom left corner and select Create Multi Output Device
  3. In the panel that appears on the right, select USB Audio Device AND Soundflower (2ch)
  4. Then hit the ⚙️ dropdown and select use this device for sound output

  1. mattingalls/Soundflower
  2. Signed Version for macOS Mojave (10.15) and earlier
  3. Soundflower | Rogue Amoeba
  4. RogueAmoeba/Soundflower-Original
  5. <file:///System/Library/Extensions/NVSMU.kext>
  6. file:///Library/Extensions/Soundflower.kext/
  7. Broadcast All Audio from Your Mac Computer
  8. 7 Useful OS X Shortcuts for Audio Engineers


Google Hangouts Workflow & Configuration

| Step | App                      | Input             | Output              | Ch Vol, etc.                                              |
|  1.  | [**Sound**][1]           | [3x Mic Input][2] | [Record Mac][2]     | `⌥+fn+F10-12` opens [**Sound**][1]                        |
|  2.  | [**LineIn**][3]          | [3x Mic Input][1] | Soundflower (2ch)   | Click **`Play Thru`**                                     |
|  3.  | [**Google Hangouts**][4] | Soundflower (2ch) | [Default device][1] | 10                                                        |
|  4.  | [**QuickTime**][5]       | Soundflower (2ch) | [Default device][1] | `⌘+I` (show inspector)<br />`⌃+⌥+⌘+N` New Audio Recording |
|  5.  | [![][5i]][5]             |                   |                     |                                                           |

Skype Workflow & Configuration

| Step | App                | Input             | Output              | Ch Vol, etc.                                              |
|  1.  | [**Sound**][1]     | [3x Mic Input][2] | [Record Skype][2]   | `⌥+fn+F10-12` opens [**Sound**][1]                        |
|  2.  | [**LineIn**][3]    | [3x Mic Input][1] | Soundflower (2ch)   | Click **`Play Thru`**                                     |
|  3.  | [**Skype**][4]     | Soundflower (2ch) | [Default device][1] | 10                                                        |
|  4.  | [**QuickTime**][5] | Soundflower (2ch) | [Default device][1] | `⌘+I` (show inspector)<br />`⌃+⌥+⌘+N` New Audio Recording |
|  5.  | [![][5i]][5]       |                   |                     |                                                           |
Workflow & Configuration Template
| Step | App                                     | Input             | Output              | Ch Vol, etc.          |
|  1.  | [**Sound**][1]                          | [3x Mic Input][2] | [Record Skype][2]   | n/a                   |
|  2.  | [**LineIn**][3]                         | [3x Mic Input][1] | Soundflower (2ch)   | Click **`Play Thru`** |
|  3.  | [**Skype**][4]/["audio app"][8]         | Soundflower (2ch) | [Default device][1] | 10                    |
|  4.  | [**QuickTime**][5]/["recording app"][9] | Soundflower (2ch) | [Default device][1] | `⌘I` (show inspector) |
|  5.  | Optional ⬎                              |                   |                     |                       |
|  6.  | [Audio MIDI Setup][2]                   | `3x Mic Input`    | `Record Skype`      |                       |
|  7.  | Other apps???⬎                          |                   |                     |                       |
|  8.  | [Chrome (YouTube, etc.)][7]             |                   |                     |                       |
  1. Micro Volume Adjustments
    • ↓🔈 ⟶ ⇧+⌥+fn+F11
    • ↑🔊 ⟶ ⇧+⌥+fn+F12
  2. Silent Volume Adjustments ⇧+fn+F11 or ⇧+fn+F11. Holding Shift doesn't work for micro adjustments.

Here are some of the resources that were helpful to me.

If you're going to go the LineIn/Sunflower method, this will help you configure your setup. Broadcast All Audio from Your Mac Computer.

It shows you how to broadcast all of your computer's audio, like input devices and media players, to an online radio station. Stop at the point where you can use LineIn to route your audio to your preferred device.

From here, you can process your voice through your digital audio workstation (DAW).

Experiment with your DAW's effects or plug-ins until you get voice changes that you like.

If you're going with Audio Hijack, Recording from Skype. etc., and Record a Skype Call With Audio Hijack walk you through routing your audio correctly.

Once you've got your audio routing setup, then you can add and configure Audio Hijack's Built-In Effects.

I'll follow this message with my setup and configuration notes.


Voxal voice changer is so far the best with more customizable options for non commercial usage.

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