I want to split my stereo input channels so I can Eq one of them. They both would then go to the built-in output. I've installed SoundFloser and AU Lab on Mac OS 10.12 Sierra. I've read through the help pages for AU lab. I couldn't find anything specific to my need. With all the options, it looks like it should be possible. I've tried selecting two mono inputs. I get two left channels as input. I didn't see any way to change the source of the mono input, but I could have missed it.
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It must be done in SoundDkower and AU Lab? Anything else an option (GarageBand, premiere, audition, Logic)?– bret7600Feb 1, 2017 at 3:37
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I'm not picky about the method. AU Lab was the first I found. I just want to adjust one channel's output to my headphone to help with a hearing loss. The only input I really care about is from iTunes.– curtFeb 1, 2017 at 5:21
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3 Answers
It could be done using Rogue Amoeba's Audio Hijack which is ostensibly an audio recorder but has really comprehensive routing capabilities too.
You build your path just by drag & drop, it makes the connections for you.
Route a source to two different Channels plugins, kill left in one & kill right in the other - that way each will pass only a single side of the stereo pair.
In front of that you put two EQ plugins, then route both to a single output, headphones/speakers etc.
It's fairly expensive for a one-trick pony, but it's extremely useful if you need the trick it can do.
I posted more examples on https://apple.stackexchange.com/a/203009/85275
BTW, remember to switch it on once you've built it ;-) Button bottom left goes white & the numbers go orange & start to count time.
As a side-effect, launching any specific Hijack preset will launch any apps assigned to it.
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1After spending hours trying to find a way to get AU Lab to work, I gave Audio Hijack a try. It was real easy to set up and did what I wanted. I did have to pay $50 for the application. If you have normal hearing Soundflower and AU Lab should be fine.– curtFeb 5, 2017 at 19:43
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Glad you got your solution - as I said, one-trick-pony, but it's a very well-crafted one trick.– TetsujinFeb 5, 2017 at 19:49
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And is there something simpler? Basically controlling L-R balance for individual app is enough. By the way, Audio Hijack has small latency, which is noticeable when making something realtime. Mar 7, 2018 at 11:23
Indeed you can split stereo input with Soundflower and AU Lab and apply an effect on one channel only.
- Set Soundflower as mac audio output,
- create a new document in AU Lab,
- add another Audio Input… ⇧⌘A,
- double click on first (left) input track, change Input Channels to mono and confirm,
- adjust accordingly second (right) input track, remember to drag the brown bar to the right cell in the compartment labeled Soundflower Input Stream #1,
- turn Panner knobs full left/right on respective input tracks,
- apply the desired effect on the track of your choice,
- configure Output Settings in Studio ⇧⌘I if necessary.
AU Lab with split channels and Equalizer effect applied to the right channel only:
For everyone here not able to make AU Lab run on Catalina:
Just put AU Lab to the Application folder, and manually edit the TCC trust database:
sudo sqlite3 /Users/$USER/Library/Application\ Support/com.apple.TCC/TCC.db "insert into access VALUES('kTCCServiceMicrophone','com.apple.audio.aulab',0,1,1,NULL,NULL,NULL,'UNUSED',NULL,0,1541440109) ;"
