BlackHole [1] is a modern alternative to Soundflower.

[1] https://github.com/ExistentialAudio/BlackHole

Seconding this, I recently switched to Blackhole. I think because Soundflower is no longer being developed.

Seconding blackhole, in my experience it works as well as Soundflower worked 5 years ago

Soundflower + AULab (download from https://developer.apple.com/download/more/), both free.

Alt AULab link, without the requirement of an Apple ID to download: https://www.apple.com/ca/itunes/mastered-for-itunes/

Unfortuntely i think you need to use both Audio Hijack and Loopback together. It's a combo from same developer.

It's quality software but a bit unintuitive how to set this up. First you create virtual audio source in loopback then with audio hijack you can route adjusted audio to this source you can't route to normal outputs. Also you need to have hijack turned on "record" for the effects to work.

But after that it works pretty well and you can add pretty cool things like... you can record both raw input and procesed input and route to your destination at the same time. Or you can mix in other apps like music into recording/routing.

Sidenote I've also tried BlackHole and unfortunately didn't have too much luck with it. It somehow worked as Loopback alternative but i think Loopback / Hijack share same audio drivers/code so integration seems smoother.

sorry to hijack your thread, I have nothing to help you on this. Instead, I need some help with my setup and I wonder if you can help me! I started doing some remote piano classes. I have a midi controller and use Logic's piano. I want to play with 'local' latency, but still send the logic sound via zoom (or any other app). To do that today, I have to use an 'Aggregate Device', which introduces ~60ms of latency, making it super hard to practice. Did you face this problem as well?If yes, did you find a solution? Thanks!

If you use Loopback (and you may also use Audio Hijack for finer-grained control) you can create virtual devices that can be selected from within Zoom (for example) while being monitored through, say, a pair of headphones.

Here's a crude diagram that shows how this might work:

  +--------------------------------------------------------------------------------------+
  |                             Loopback: virtual_keyboard                               |
  |                                                                                      |
  | +-------------------+      +-----------------------+    +--------------------------+ |
  | |MIDI / Logic piano |      |output channels: L & R |    | monitors: headphones     | |
  | | (Pass+Thru)       +----->+                       +--->+                          | |
  | +-------------------+      +-----------------------+    +--------------------------+ |
  +--------------------------------------------------------------------------------------+
  
  +---------------------------------+
  | Zoom                            |
  | +---------------------------+   |
  | | input: virtual_keyboard   |   |
  | |                           |   |
  | +---------------------------+   |
  +---------------------------------+

I believe this would reduce the latency from your keyboard to your monitors while any lag Zoom has processing the audio (and probably) video would be slightly increased.

thanks, I'll try that!

Maybe Soundflower? https://rogueamoeba.com/freebies/soundflower/

One of these (probably Loopback?) should work https://rogueamoeba.com/

I don't know of free, good alternatives.

Free: iShowU Audio, Soundflower

Paid: Loopback, Audio Hijack, Sound Siphon