AAC support for Roon on DSM 6?

No, I think you are talking about DSM7 not DSM6 installation…

Hmmm - ok - could be.

There is a text file called RoonOnNAS.log.txt in your Roon database directory. Do you have a line similar to the one that looks like the one in bold?

19.01.24-15:53:06 — ROON_DATABASE_DIR: /var/packages/RoonServer/shares/Roon SSD/RoonOnNAS
19.01.24-15:53:06 — ROON_DIR: /var/packages/RoonServer
19.01.24-15:53:06 — Model: DS1522+
19.01.24-15:53:06 — Architecture: x86_64
19.01.24-15:53:06 — DSM Version: 7.2.1 (Update 3)
19.01.24-15:53:06 — PKG Version: 20220216
19.01.24-15:53:06 — Hostname: Tunes
19.01.24-15:53:06 — MTU: 1500 1500
19.01.24-15:53:06 — ROON_DEBUG_ARGS: -noraatserver
19.01.24-15:53:06 — ffmpeg: /var/packages/RoonServer/shares/Roon SSD/RoonOnNAS/bin/ffmpeg
19.01.24-15:53:06 — RoonServer PID: 10057

########## Installed RoonServer Version ##########
200001359
2.0 (build 1359) production
production
##################################################

This is mine… no ffmpeg

30.01.24-07:03:02 — Starting Roon Server …
30.01.24-07:03:02 — ROON_DATABASE_DIR: /volume3/RoonServer
30.01.24-07:03:02 — ROON_DATABASE_DIR_FS: -
30.01.24-07:03:02 — Free Inodes: 0
30.01.24-07:03:02 — ROON_DIR: /var/packages/RoonServer/target
30.01.24-07:03:02 — Model: DS1512+
30.01.24-07:03:02 — Synology Serial: C7KAN00746
30.01.24-07:03:02 — Architecture: x86_64
30.01.24-07:03:02 — Total Memory: 3076104
30.01.24-07:03:02 — Available Memory: 2256088
30.01.24-07:03:02 — DSM Version: 6.2.4 (Update 7)
30.01.24-07:03:02 — PKG Version: 2022-05-14
30.01.24-07:03:02 — Hostname: NASMedia
30.01.24-07:03:02 — INODES: 1000000
30.01.24-07:03:02 — ROON_DEBUG_ARGS:
:: Loading module soundcore … [ OK ]
:: Loading module snd-page-alloc … [ OK ]
:: Loading module snd … [ OK ]
:: Loading module snd-seq-device … [ OK ]
:: Loading module snd-rawmidi … [ OK ]
:: Loading module snd-usbmidi-lib … [ OK ]
:: Loading module snd-hwdep … [ OK ]
:: Loading module snd-timer … [ OK ]
:: Loading module snd-pcm … [ OK ]
:: Loading module snd-usb-audio … [ OK ]
:: Loading module snd-mixer-oss … [ OK ]
:: Loading module snd-pcm-oss … [ OK ]
30.01.24-07:03:04 — RoonServer PID: 17905

########## Installed RoonServer Version ##########
200001359
2.0 (build 1359) production
production
##################################################

Disclaimer: these instructions are for DSM 7 but they should be similar in DSM6.

  1. Go into your Control Panel on DSM and find the Shared folder for your Roon database.

  2. Hit the Edit button.

  3. Go to the Permissions tab.

  4. There is a dropdown whose default is “Local users” - switch it to “System internal user”

  5. Scroll down to RoonServer and make sure it looks like this:

  1. Press Save.

No RoonServer user in “System internal user” for DSM6. I think it’s a DSM7 Roon feature.

At this point, I recommend reaching out to RoonOnNAS author @crieke . I am sorry that I have run out of ideas. I really want to help.

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Thanks a lot for your ideas and support!
I’ll write a PM to Crieke… and if we’ll find a solution I’ll write here…

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For local AAC files you may try “.m4a” as file name extension. That’s what I have when converting to AAC using dBpoweramp.