--- title: How do I use Symphony I/O connected to ProTools HD for audio output of other apps? description: How do I use Symphony I/O connected to ProTools HD for audio output of other apps? --- [Skip to content](https://knowledge.apogeedigital.com/how-do-i-use-symphony-i/o-connected-to-protools-hd-for-audio-output-of-other-apps#main-content) English Show submenu for translations [Contact us](https://knowledge.apogeedigital.com/kb-tickets/new?hsLang=en) ![Apogee Logo White.png\]](https://knowledge.apogeedigital.com/hs-fs/hubfs/Apogee%20Logo%20White.png?height=40&name=Apogee%20Logo%20White.png) Open main navigation Close main navigation - English Show submenu for translations - [Contact us](https://knowledge.apogeedigital.com/kb-tickets/new) - Go to apogeedigital.com Go to apogeedigital.com How can we help you? - There are no suggestions because the search field is empty. 1. [Knowledge Base](https://knowledge.apogeedigital.com/?hsLang=en) 2. [Legacy Products](https://knowledge.apogeedigital.com/legacy-products?hsLang=en) 3. [Symphony I/O Mk 1](https://knowledge.apogeedigital.com/legacy-products?hsLang=en#symphony-i-o-mk-1) # How do I use Symphony I/O connected to ProTools HD for audio output of other apps? -Make sure Symphony I/O is in "ProTools HD" AIM (Audio Interface Mode for ProTools HD, HD-Native, HDX) by pressing in and holding on the right-side front-panel encoder until it comes to the AIM menu. It should say "ProTools HD"... if it doesn't, scroll through the menu until it does and then push in on the encoder again to select it. The Symphony I/O will power down and then restart in ProTools HD AIM. -Make sure the Symphony I/O is connected to a ProTools HD (HD, HD-Native, or HDX) card and that you have installed the proper ProTools software. -Make sure ProTools is NOT open. Also make sure any application you want to use is closed. -Open Audio MIDI Setup (Applications Utilities Audio MIDI Setup) and select the ProTools hardware as the computer's default output. -Open up the desired application, for example iTunes, play an audio file and you should see the ProTools CoreAudio driver open up and see/hear the output on the Symphony I/O. - [BOOM](https://knowledge.apogeedigital.com/boom?hsLang=en#main-content) - [User Guide](https://knowledge.apogeedigital.com/boom?hsLang=en#user-guide) - [Getting Started](https://knowledge.apogeedigital.com/boom?hsLang=en#getting-started) - [Troubleshooting](https://knowledge.apogeedigital.com/boom?hsLang=en#troubleshooting) - [FAQs](https://knowledge.apogeedigital.com/boom?hsLang=en#faqs) - [Duet 3](https://knowledge.apogeedigital.com/duet-3?hsLang=en#main-content) - [User Guide](https://knowledge.apogeedigital.com/duet-3?hsLang=en#user-guide) - [Getting Started](https://knowledge.apogeedigital.com/duet-3?hsLang=en#getting-started) - 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