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Back at the start of January this year we filed a bug report that still hasn't been acknowledged. Before we file a code level support ticket, we would love to know if there’s any one else out there who has experienced anything similar. We have read documentation (and again repeatedly) and searched the web over and still found no solution and this issue does look like it could be a bug in the system (or our coding) rather than proper behaviour. The app is a host for a v3 audio unit which itself is a workstation that can host other audio units. The host and audio unit are both working well in all other areas other than this issue. Note: This is not running on catalyst, it is a native Mac OS app. ( not iOS ) The problem is that when an AUv3 is hosted out of process (on the Mac) and then goes to fetch a list of all the other available installed audio units, the list that is returned from the system does not contain any of the other v3 audio units in the system. It only contains v2. We see this issue if we load our AU out of process in our own bespoke host, and also when it loads into Logic Pro which gives no choice but to load out of process. This means that, as it stands at the moment, when we release the app our users will have limited functionality in Logic Pro, and possibly by then, other hosts too. In our own host we can load our hosting AU in-process and then it can find and use all the available units both v2 and v3. So no issue there but sadly when loaded into the only other host that can do anything like this ( Logic Pro at the time of posting) it won't be able to use v3 units which is quite a serious limitation. SUMMARY v3 Audio Unit being hosted out of process. Audio unit fetches the list of available audio units on the system. v3 audio units are not provided in the list. Only v2 are presented. EXPECTED In some ways this seems to be the opposite of the the behaviour we would expect. We would expect to see and host ALL the other units that are installed on the system. “out of process” suggests the safer of the two options and so this looks like it could be related to some kind of sand boxing issue. But sadly we cannot work out a solution hence this report. Is Quin “The Eskimo” still around? Can you help us out here?

Using latest version of Ventura on an M1 iMac... 2 issues I've noticed when an Auv3 is loaded Out Of Process... 1 - When using tokenByAddingRenderObserver: The provided block is never called if an Auv3 is loaded out of process. 2: When loaded In process an Auv3 audio unit that is itself a host for other audio units can see all the audio units in the system. That is all v2 units and all v3 units. When loaded Out of Procress and the same v3 unit can only find the v2 units when querying. The system appears to be hiding the installed v3 units. This seems like the reverse of what I would expect. When sandboxed (out of process) why are other V3 units hidden from inspection? I've filed bug reports on these ages ago but had no response. I'm particularly interesting in issue #2 above as it makes a big difference when our AU host unit is running in Logic which only allows loading out of process. When loading into our own host app we can load the au in-process and it works nicely, able to host any other unit installed on the system.

We're seeing the following when running auvaltool It seems AUParameterNode cannot be constructed with a default value and has no option to set default values via property or method so what does this mean? .... Does it mean we ALSO have to iterate all the parameters using the old fashioned long winded toolbox calls ? Or does it mean nothing at all? The "Will fail in future auval version" is worrying! Values: Minimum = 5.000000, Default = 0.000000, Maximum = 300.000000 Flags: Expert Mode, Readable,  WARNING: use -strict_DefP flag * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Parameter's Published defaultvalue does not fall with [min, max] range  * * This will fail using -strict option. Will fail in future auval version  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *   -parameter PASS

This seems to be a sandboxing issue but the solution is not so obvious ...  Our sandboxed Audio unit extension requires a permanent folder in which to store a database which can be used by all instances of the AU. Where can we store the database in a directory so that the AU can find it regardless of which host app it's running in ? The AU supports loading in-process. The problem we have is that when the AU is running in-process in a sandboxed host app URLs to the usual directories ( ~documents, shared, app support etc ) all resolve to the sandbox container.   But when the AU is hosted in a non-sandboxed host  ( ie. Logic Pro )  the URLs resolve to the actual user folder.  (~/users/***/documents etc  ) How can the AU automatically obtain a URL that will always resolve to the same place, will be permanent, wont be hidden from the user AND still remain “legal” for distributing in the App Store?   …   thanks!