"AU Lab" tool from package "Audio Tools for Xcode 7" does not instantiate AudioUnits v3.

Originator:volodymyr.gorlov
Number:rdar://24388007 Date Originated:28-Jan-2016
Status:Open Resolved:
Product:Developer Tools Product Version:AU Lab Version 2.3 / Version 2.4 (Beta)
Classification:Other Bug Reproducible:100%
 
Summary:
There is a package "Audio_Tools_for_Xcode_7.dmg" available from Developer download area https://developer.apple.com/downloads/. It has "AU Lab" tool suitable for AudioUnit development. But this tool is not able to instantiate AudioUnits version 3.

Steps to Reproduce:
1. Create OS X Audio Unit v3 (or use already available sample plugin https://github.com/vgorloff/AUHost/releases/tag/1.0.2)
2. Register Audio Unit (App Extension) by launching your "Containing Application" (or use sample app Attenuator.app from GitHub).
3. Open "AU Lab" tool and try to insert Audio Unit effect from "Effects" dropdown list (sample plugin name is Attenuator).

Expected Results:
Audio Unit effect listed in "Effects" dropdown list. It can be successfully inserted.

Actual Results:
Audio Unit effect is not listed in "Effects" dropdown list.

Version:
OS X EL Capitan. Version 10.11.3 (15D21)
Xcode Version 7.3 beta (7D129n)

Configuration:
AU Lab Version 2.3 / Version 2.4 (Beta)

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