Blackhole is an easy, free way to do that on the Mac, right through the latest macOS Catalina. The utility Soundflower got some brand recognition among music and audio nerds after its introduction way back in 2004, and it does still have people working on support. Download Soundflower for Mac free. Inter-application Audio Routing Utility for Mac OS X.
How To Use Soundflower
Free Inter-application Audio Routing Utility for macOS
Soundflower presents itself as one of two audio devices (2ch / 16ch). The 2-channel device is sufficient for most situations.
To send the output of one application to another, select Soundflower as the output device in 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.
If you are hearing clicks or breakups, try increasing the buffer size of both applications (set within each application).
Applications
Since Soundflower offers a straight forward method of communicating between applications on the Mac, there are a variety of situations where you can employ it.
Podcasting
Soundflower has been used extensively in podcasting by combining separate streams of audio into one source. Instead of recording an interview with Skype and only hearing one voice, Soundflower lets you publish both voices for a complete interview experience.
Cellphone
Use an application called DittyBot and Skype to access your iTunes collection from any cellphone.
Music
Record streaming audio from iTunes into Audacity, or route an audio stream from iTunes to Logic.
Soundflowerbed
When using Soundflower to send audio to and from applications, you may find that you are not able to send audio through another device to monitor audio output. In such situations you can use Soundflowerbed, an application that resides in the Finder’s Menubar allowing you to tap into Soundflower channels and route them to an audio device.
Download: Soundflower 1.6.6 Installer (includes SoundflowerBed) -- Use this for OS 10.6 - OS 10.8
https://code.google.com/archive/p/soundflower/downloads
System Requirements
Soundflower 1.5.1 requires Mac OS 10.5.
Soundflower 1.4.3 requires Mac OS 10.4.
Soundflower 1.3.1 requires Mac OS 10.2.8 or later.
Mac Topics That May Interest You:

VST & Audio Units Plug-ins in Mac OS XSM Pro Audio VFX Software for Intel Mac OS X
How to setup Garage Band, Sound-flower, IAC, VFXApple's Boot Camp
SoundFlower ConfigurationGarageBand Aggregate Device
IAC (Inter-Application Communication) BusAudacity VST Enabler
WACVST (Windows-Mac VST)VSTAU Manager (VST to AU Adapter)
How To Use SoundflowerHow to capture audio with Soundflower
VSTis a trademark of Steinberg Soft- und Hardware GmbH
Soundflower Software
Welcome to our Soundflower installation guide. Installing Soundflower on modern macOS versions can be a little complicated as kernel extensions need now to be given permissions before being loaded for the first time. So the Soundflower installer will error out on macOS High Sierra and Mojave. But this is easy to fix.
macOS 10.13 High Sierra and macOS 10.14 Mojave Soundflower Install
- Download the installer: soundflower_2.0b2.zip.
- Run it and perform the install
- The installer will tell you that it failed. This is completely normal.
- Open the System Preferences and go to the “Security & Privacy” settings.
- Click on the “Allow” button next to “MATT INGALS”.(This has to be a physical hardware click. Remote desktop connections or even local software tools like “Better Touch Tool” won’t work!)
- Run the installer again. This time it will run through without any problems.
Soundflower For Mac Sierra
Click 'Open Security Preferences'
Click on the Allow button and run the installer again.
IMPORTANT: If you can’t record from Soundflower under Mojave (the device is there but only silence is being recorded) make sure that you have given microphone access permissions to your recording app! macOS treats Soundflower like a microphone in this regard. Go to system preferences -> Privacy & Security -> Privacy -> Microphone -> [check mark next to your recording app]
See our blog post about this issue: https://www.fluxforge.com/blog/recording-problems-on-mojave/
macOS 10.10 - 10.12 Soundflower Install
Because we’re getting this asked a lot: Here’s how you get Soundflower to work with macOS 10.12 Sierra and OS X 10.10 and 10.11…

As you know, since 10.10, OS X requires kernel extensions to be signed. Sadly the officially available version of Soundflower isn’t signed because it’s an open source project and - as far as we know - no one has volunteered to do the work and pay the $99 fee to obtain a signing certificate.
That’s why we have built a signed version of Soundflower which will work on OS X 10.10, 10.11 and the new macOS 10.12 Sierra.
Here is the direct download link: soundflower_2.0b2.zip.
Download the zip and run the contained installer. Even though not required you probably should restart your Mac to make sure everything got installed properly.
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Enjoy!
Please note that we can’t offer direct support for Soundflower. We just built a version you can install on macOS 10.11 and 10.12. If you encounter any problems please contact Soundflower’s developer! You can find their project page here: https://github.com/Soundflower-Original
Shameless self promotion: Have you tried Vector yet? Vector is an audio editor for OS X that is designed to fit into the space between simple audio apps and full blown studio production tools. (Kinda like Cool Edit Pro for the Mac - if you are that old school).