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[The Computer Audiophile]

Hi Guys, I'm getting some serious phase / polarity issues when using a VST3 plugin in MC 33.0.72. It may have existed for a while, I'm unsure.

Was anything done recently to the VST3 and 7.1.4 channel configs in MC? When I use the same plugin (Hang Loose Convolver) outside of MC, routing to it via Blackhole, everything sounds perfect.

[The Computer Audiophile]

I went back to MC 33.0.44 and the issue isn't present in that version. Something seems off with VST3 plugins and 7.1.4 channel configs in new versions of MC.

[mattkhan]

probably

33.0.67 (2/13/2025)

1. Changed: Revised the layout of 12 channel VST3 to be the standard 7.1.4 and 13 channel to be 7.1.4 + extra LFE.

33.0.65 (2/6/2025)

3. Changed: Added speaker layouts for 13 and 14 channel VST3 output.

there's a thread on the windows board on the subject IIRC

[The Computer Audiophile]

I will also add, the issue is totally gone on all versions of MC when using the native convolution engine, that doesn't require VST3 plugins.

[The Computer Audiophile]

I settled on MC version 33.0.53 for now. Hopefully the newest versions can be adjusted.

[whoareyou]

Is this happening only with  7.1.4, or other formats, and is this based strictly on listening?  I'm trying to understand how to test this out. Haven't done much listening lately, but I haven't noticed anything odd (so far).

[JimH]

Both Matt and Bob are out this week.

[mattkhan]

https://yabb.jriver.com/interact/index.php/topic,140559.msg975276.html#msg975276

The channel mapping change is in the above post

If you don't expect this change then clearly it's going to cause problems

[The Computer Audiophile]

Is this happening only with  7.1.4, or other formats, and is this based strictly on listening?  I'm trying to understand how to test this out. Haven't done much listening lately, but I haven't noticed anything odd (so far).

My channel setup is 7.1.4 and I first noticed it with the new Quadio material that I received. It's 4.0, played in a 7.1.4 / 12 channel container because I have 7.1.4 selcted in MC.

I noticed it by ear for sure. It sounded out of phase and without much bass. My audio interface, Merging Anubis, has phase / polarity inversion buttons for each channel. I flipped the polarity on the rear channels and the sound seemed to come back into phase, with much better bass.

[The Computer Audiophile]

Both Matt and Bob are out this week.

Thanks Jim. Using an older version is fine for me right now.

[The Computer Audiophile]

Is this happening only with  7.1.4, or other formats, and is this based strictly on listening?  I'm trying to understand how to test this out. Haven't done much listening lately, but I haven't noticed anything odd (so far).

One addition thing just came to mind. If you have any quad content that uses the front L and R, and rear L and R, it's much easier to hear the issue. I believe the VST3 switch to Steinberg left the first 6 or so channels the same. Singling out the front and rear make it easy. Let me know if you need any test content for 4.0 that plays in a 7.1.4 container in MC.