SurroundPluginDemo AUv3 incorrect channel mapping in Logic Pro 10.7.6

Audio Plugins
1

This is about SurroundPluginDemo in JUCE 7.0.4 when building in AUv3 format.

First of all it doesn’t pass AU validation (AuVal tool) and crashes Logic — You need comment creating AUX input and output audio busses:

AudioProcessor (BusesProperties().withInput  ("Input", AudioChannelSet::stereo())
                                           //.withInput  ("Aux", AudioChannelSet::stereo(), false)
                                           .withOutput ("Output", AudioChannelSet::stereo()))
                                           //.withOutput ("Aux", AudioChannelSet::stereo(), false))

Second and more important for me — there is incorrect channel mapping in surround (more 2 channels) track mode. For example: create 5.1 track in Logic and You see LFE (for example) mapped to wrong channel — the only channels that have correct mapping are Left and Right.

Switching I/O Assignment in Logic Preferences makes following:

  1. Routing LFE (for example) to Output 1 is correct — signal appears on 1st channel of AUv3 plug-in;
  2. Routing LFE (for example) to Output 2 is correct — signal appears on 2nd channel of AUv3 plug-in;
  3. Routing LFE (for example) to Output 3 is incorrect — signal appears on 5th channel of AUv3 plug-in;
  4. Routing LFE (for example) to Output 4 is incorrect — signal appears on 6th channel of AUv3 plug-in;

And so on… Surround channel mapping for AUv3 plug-in is chaotic in Logic.

It’s fair to say this AUv3 surround channel mapping bug is reproduced with Apple AUv3FilterDemo plug-in too, so I guess it’s Apple-side Logic+AUv3 bug.

Am I right? Any other opinions?

P.S. AUv2-version of SurroundPluginDemo works absolutely right in Logic.
P.P.S. AUv3-version of SurroundPluginDemo works absolutely right in Reaper.

1 Like
Noise Gate - AUv3 Validation Error
2

Second and more important for me — there is incorrect channel mapping in surround (more 2 channels) track mode. For example: create 5.1 track in Logic and You see LFE (for example) mapped to wrong channel — the only channels that have correct mapping are Left and Right.

hi @NickSD - i’m trying to get SurroundPluginDemo running in auv3 + logic. i commented out the lines you mentioned but i can’t figure out what i need to do to get to the the above steps?

my project has Spatial Audio set to Dolby Atmos. i’ve tried all the various Surround Format settings. my track is a Software Instrument track set to Surround mode.

with all of the above i still only see SurroundPluginDemo available in stereo mode. what steps am i missing here?

3

Hi, @modosc, I use multichannel plug-ins (such as SurroundPlugin) on Master Track in Logic (projects created with Spatial Audio option set to Dolby Atmos), not in Software Instrument Track.