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How can I mirror the stereo audio output on output channels 1 & 2 to channels 3 & 4 on my 4-channel sound interface (Focusrite Scarlett 2i4) using free software without adding more cables?

Currently I am successfully mapping channel 1 to 3 and channel 2 to 4 with the trial version of Rogue Amoeba Loopback, but the trial version only lasts 20 minutes.

I have tried to do this with "Audio MIDI Setup" but it is not supported. Bear in mind this is on a 2012 Macbook Air locked to macOS 10.9, so it cannot be upgraded (ever).

Petrus Theron
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  • "locked to macOS 10.9" - no Mac tops out at 10.9. The 2012 should be good to Catalina. – Tetsujin May 08 '23 at 12:15
  • @Tetsujin maybe I'm doing something wrong but I've tried to upgrade several times and it fails every time. – Petrus Theron May 08 '23 at 13:59
  • See https://apple.stackexchange.com/questions/309399/how-can-i-download-an-older-version-of-os-x-macos [which is in the process of being updated… again] 10.9 probably can't see the App Store properly these days. You might have to go to EL Cap, then High Sierra before you can jump to Ctalina [With caveat, Catalina will no longer run anything 32 bit, so you may want to stop at Mojave if you rely on anything that can't be updated.] – Tetsujin May 08 '23 at 14:02
  • I am still looking for a solution to this as Rogue Amoeba Loopback costs $114 and I can't afford it. – Petrus Theron Oct 08 '23 at 08:25
  • Blackhole might be able to do this. I haven't tested it, as I already own all the Rogue Amoeba stuff. – Tetsujin Oct 08 '23 at 08:35
  • @Tetsujin unfortunately, Blackhole cannot do this. – Petrus Theron Oct 10 '23 at 17:01

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