# Aux – Music app for your NAS — Synology NAS audio player > Synology NAS audio player (iPhone/iPad app by Xerxes Engineering LLC.) - Source: https://appshunter.io/ios/app/aux-music-app-for-your-nas/id6667106408 (this page in markdown: same URL + `.md`) - Developer: [Xerxes Engineering LLC](https://appshunter.io/developer/418665833) - Category: Music, Entertainment - Price: Free with in-app purchases - Age rating: 4+ - Requires: iOS 18.0 · 18 MB - Languages: English - Released: 2024-09-09 - Data updated: 2026-05-24 - User reviews in markdown: https://appshunter.io/ios/app/aux-music-app-for-your-nas/id6667106408/reviews.md ## What is Aux? Aux is a music player for your Synology NAS. The Aux app works with Audio Station running on your NAS to stream or download any audio file compatible with iOS, including lossless and high resolution audio formats — MP4 / AAC, MP3, Apple Lossless, FLAC, WAV, Dolby Digital, Dolby Digital Plus, and Dolby Atmos spatial audio. Aux is a fast, ad-free, and feature-rich app that connects directly to your NAS. Since Aux uses no servers of its own, your username, password, and all other data are exchanged securely and directly with your NAS. If you've chosen not to expose your NAS directly to the internet, Aux also works with Synology's own QuickConnect service to relay the connection through Synology's secure servers. Server Management • Secure, encrypted, HTTPS network connections • Connect by QuickConnect, domain, DDNS, or IP address • Secure, encrypted login with 2FA / OTP support • Secure Keychain storage with Touch ID / Face ID protection • Multiple server / NAS support • Download mode for offline playback • Streaming mode for real-time playback • Dynamic, automatic reconnection when switching networks with QuickConnect (LAN to WAN and vice versa) • Download manager to pause, cancel, reorder, and restart downloads • Smart management of background and audio download sessions to keep downloads going in the background Music • Audio Station folder, artist, album, and song browsing • File Station folder browsing — view images and files, download audio formats not recognized by Audio Station • Pinned item support for quick access to favorites • Search your NAS or downloaded files across artist, album, track title, or file / folder name • Link sharing (DSM) and file export (iOS share sheet) • Queue downloads of entire artists, folders, or subfolders • View MP3 / MP4 / FLAC tags and audio metadata indexed by Audio Station • View album- and file-level artwork, tap to view fullscreen • Build a playlist with replace, shuffle, insert, append • Choose to download or stream audio by default and when adding items to your playlist Audio Player • Play any audio format supported by iOS, including Dolby Audio formats not supported by Audio Station • Gapless playback • Lossless and high resolution audio support (16/44 to 24/384 — only limited by your DAC — no forced transcoding to 16/48 WAV) • Seek & skip with Siri, lock screen, headphone remote, or in-app controls • Tap & hold to seek ahead / back instantly (no more waiting to seek) • Seek across track boundaries to hear the end of that last song one more time • A/B song comparison — mark a time, then all tracks start at the marked time • Artwork view for album / file artwork, tap to view fullscreen • Playlist view to manage queued tracks • Metadata view for MP3 / MP4 / FLAC tags and audio metadata • AirPlay output with bitstreaming / buffering options • Shuffle / unshuffle, repeat track, repeat playlist • Saved playlist and playback position across app launches UI • Optimized for one-handed use on the go — important controls are on the lower third of the screen • Quick list controls — tap & hold to enter edit mode; two-finger drag to select; buttons to select all / none, pin, share, add to playlist, download • Haptic feedback for gestures and interactions • Many customization options — • Keep-ahead x tracks for downloads/streams • Choose between skip or seek controls • Skip/seek by x seconds • Pause audio on interruptions • AirPlay bitstreaming (for surround sound) or 24-bit / 48kHz ALAC buffering • Replace or append to the current playlist by default • Written with the latest native Apple technologies from the ground up — Swift, SwiftUI, SwiftData, etc Aux is developed independently and is not affiliated with Synology Inc. Aux requires an affordable subscription to support its continued maintenance & development. Try it out with a free trial, and if you find something you’d like to see changed, we’re happy to receive feature requests. Terms of Use: https://bit.ly/app-stdeula ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Annual | $9.99 | per year | | Monthly | $0.99 | per month | ## Version history (last 5 releases) ### 2.4 — 2026-05-18 New & improved • Added URL formatting assistant to help guide successfully connecting to a NAS • Published Help Center articles on DSM and Aux configuration options • Added Help Center buttons to the Add/Edit NAS screen and Settings > Support screen • Added custom player seek bar • Improved server-switching logic to avoid signing out when switching to a new NAS • Improved touch targets for expandable/collapsible sections Fixed • Fixed crash when setting Repeat mode to All when the playlist had only one track ### 2.3 — 2026-04-29 • Added support for transcoding file formats supported by the NAS, generally targeting 128kbps MP3 or 16/44 WAV. • Added support for automatically transcoding formats not supported for playback by iOS. • Added support to prevent transcoding of formats not supported for transcoding on the NAS (e.g., AAC). • Added options in Settings to force transcoding all files. • Added options in the Edit toolbar to transcode specific files when adding to the playlist. • Added persistent metadata for bitrate, bit depth, sample rate, and codec, to display when the file has been transcoded or hasn’t yet been loaded by the player. • Added ‘Download Remaining’ button to the toolbar for local albums. Tap to download all remaining files for the folder or album. • Added ‘Download All’ button to the toolbar for the playlist. Tap to immediately download all tracks on the playlist. • Added tappable file path (file location on the NAS) to the metadata displayed for files, downloads, and the current item in the playlist. Tap to navigate to the folder on the NAS tab. • Added progress messages during sign in. • Added new nav bar buttons on the root of the NAS tab, showing the connected NAS address and option to switch NAS servers without signing out. • Added error display when folders, artists, or albums fail to load. • Improved display of local download indicators when browsing folders, artists, albums, and songs. • Improved handling of resumed downloads across hostname changes with QuickConnect. • Improved handling of the current session across QuickConnect hostname changes. • Fixed download resolution for albums & artists. • Fixed album artwork for folders when navigating from search results. • Bug fixes and performance improvements. ### 2.1 — 2026-02-11 New in Aux 2.1 ∙ Improved support for QuickConnect relay service via Synology Relay Server. General improvements in Aux 2.0 ∙ All new Liquid Glass design for iOS 26 ∙ Updated to floating folder toolbar ∙ Added ‘Download all’ button to server folders ∙ Add A/B comparison feature ∙ Added edit toolbar buttons when viewing direct search results ∙ Added Support Center for subscription management and sending support requests directly within the app ∙ Improved synchronization of player and playlist ∙ Improved download caching on disk ∙ Improved handling of additional Synology DSM errors ∙ Improved handling of resume data for orphaned downloads ∙ Improved download priorities when inserting songs into the playlist ∙ Improved download error descriptions ∙ Improved QuickConnect handling, including over a LAN when internet is unavailable ∙ Show files missing from disk on launch (e.g., when restored from a backup) Stability & reliability ∙ Numerous bug fixes and performance improvements Tech internals ∙ Swift 6 ∙ Swift Strict Concurrency ∙ Completely refactored player, downloader, and SwiftData persistence layer to migrate from Combine to Concurrency ∙ Minimum OS is now iOS 18.0 ### 2.0 — 2026-01-17 General improvements in Aux 2.0 ∙ All new Liquid Glass design for iOS 26 ∙ Updated to floating folder toolbar ∙ Added ‘Download all’ button to server folders ∙ Add A/B comparison feature ∙ Added edit toolbar buttons when viewing direct search results ∙ Added Support Center for subscription management and sending support requests directly within the app ∙ Improved synchronization of player and playlist ∙ Improved download caching on disk ∙ Improved handling of additional Synology DSM errors ∙ Improved handling of resume data for orphaned downloads ∙ Improved download priorities when inserting songs into the playlist ∙ Improved download error descriptions ∙ Improved QuickConnect handling, including over a LAN when internet is unavailable ∙ Show files missing from disk on launch (e.g., when restored from a backup) Stability & reliability ∙ Numerous bug fixes and performance improvements Tech internals ∙ Swift 6 ∙ Swift Strict Concurrency ∙ Completely refactored player, downloader, and SwiftData persistence layer to migrate from Combine to Concurrency ∙ Minimum OS is now iOS 18.0 ### 1.3 — 2025-05-05 Bug fixes and performance improvements. ## Apps similar to Aux | App | Rating | Price | Category | | --- | --- | --- | --- | | [LPKMusic](https://appshunter.io/ios/app/lpkmusic/id6502742929) | — | Free | Music | | [AVSub](https://appshunter.io/ios/app/avsub/id923424694) | 3.8 (65) | $3.99 | Music | | [SoundScoop - Video to Audio](https://appshunter.io/ios/app/soundscoop-video-to-audio/id6473403720) | 5.0 (4) | Free | Music | | [Volume Booster ▸](https://appshunter.io/ios/app/volume-booster/id6523423683) | — | Free | Music | | [D'AGOSTINO DSM](https://appshunter.io/ios/app/dagostino-dsm/id1505964665) | — | Free | Music | | [Sonora - Music Player](https://appshunter.io/ios/app/sonora-music-player/id6749087467) | 4.5 (2) | Free | Music | ## Related topics [xerxes engineering llc](https://appshunter.io/ios/topics/xerxes-engineering-llc) · [xerxes](https://appshunter.io/ios/topics/xerxes) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-05-24.*