--- title: Symphony 64 | ThunderBridge not recognizing Symphony I/O description: Symphony 64 | ThunderBridge not recognizing Symphony I/O --- [Skip to content](https://knowledge.apogeedigital.com/symphony-64-thunderbridge-not-recognizing-symphony-i/o#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) # Symphony 64 | ThunderBridge not recognizing Symphony I/O **Symptom:** Symphony I/O does not show up in Maestro or properly function when connected to Symphony 64 | ThunderBridge  **Solution:** There are a number of logical and easily correctable causes for this.  Please examine the following steps: 1. Confirm that you have both the latest firmware and software installed. 2. Verify that the PC-32 cable is properly connected from the main port on the back of Symphony I/O to the first port on Symphony 64 | ThunderBridge. 3. Confirm that the Symphony I/O is set to "Symphony" AIM mode.  To verify, push in and hold on the right-side front-panel encoder. This will bring you to the AIM selection menu. If its not already selected, scroll to Symphony and then push in on the right-side encoder to select and the unit will restart. 4. Make sure you have selected the correct “Source” setting in Audio MIDI Setup. - - Open “Audio MIDI Setup” (Applications Utilities Audio MIDI Setup) and select Symphony64 on the left-side device column. - Go to the “Source” drop-down menu in the main part of the Audio MIDI Setup window and set it for the appropriate port selection. If you’re using only 1 Symphony I/O, set it for “PCI Card 1, Port 1 (Chs 1-32)”. If you’re using 2 SymI/O’s, set it for “PCI Card 1, Port 1-2 (Chs 1-64)”. 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