What is the "IAC Driver Bus 1"?

When I start Logic, I get a message that reads:

"Instrument "IAC Driver Bus 1" sends to a MIDI port named "Bus 1" of MIDI interface "IAC Driver" which no longer exists."

What the heck is this?! How do I correct the problem?

Logic Pro X, macOS High Sierra (10.13)

Posted on Oct 2, 2017 8:54 AM

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2 replies

Oct 2, 2017 10:36 AM in response to AGMusicInc

IAC Driver is a default MIDI Device in the Audio MIDI Setup utility (/Applications/Utilities). It lets you route MIDI messages between Application that supports that protocol. Hence the name IAC, Inter-Application Communication.


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Maybe the device is turned off. Double click on the icon and make sure the online checkbox is enabled

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Hope that helps


EdgarRothermich - LogicProGEM.com

(Author of the "Graphically Enhanced Manuals")

http://DingDingMusic.com/Manuals/

'I may receive some form of compensation, financial or otherwise, from my recommendation or link.'

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What is the "IAC Driver Bus 1"?

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