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Audio overload on playback with multiple HOA files and vsts

Hello all (and hello Thibaut!),

I’m trying to play back three 3rd-order Ambisonic files (each ~ 600 MB) simultaneously using three spat5.sfplay~ @channels 16 @mc 1 instances, each routed to ezdac~ via an individual mcs.vst~ object (same Ambisonic binauralizer plugin, different parameters from realtime OSC input).

When I tried to load only one file and start the audio engine (without activating the OSC), the decoded audio was already super glitchy and slow. The spat5.monitor suggested the audio engine was overloaded. Before this, I checked the code on a separate patch with only one file, one spat5.sfplay~ object, and one plugin, and everything works together nicely with the audio engine operating at 60% capacity.

My laptop is an Apple M1 Pro with 32 GB memory, pretty decent for most multichannel applications - until now. My audio settings for Max are 2048 for I/O vector size and 512 for signal vector size (512 is the minimum value this particular plugin can do). Any advice on streamlining audio buffering or vst~ processing is greatly appreciated!

Thanks,
Niki

Hello Niki,

Well, if one plugin takes 60% of audio resources, it seems clear that the problem is with the VST plugin you’re using (and likely not a problem with spat5.sfplay~). Running 3 instances won’t work.
Which VST are you using ? If free software, can you maybe send it to me, along with your patch ? I’ll have a look (also to check if there’s other heavy processing in the pipeline).

Reducing the rate of the OSC data might help, but I doubt it would totally solve the audio overload issue.

Alternatively, you could use spat5.hoa.binaural~ @order 3 @dimension 3D @mc 1. It sounds decently good (in recent versions of spat). It is also CPU intensive, but uses “only” about 15% (per instance) on my M1 laptop.

Hope this helps,
T.

Hi Thibaut,

Thanks for the suggestions! Indeed the problem seems to come from the plugins alone - simply loading all three of them and turning on the audio made the audio engine go overload.

The VST I’m using is BinauralVR (COMPASS suite). Sadly I cannot use spat5.hoa.binaural~ as I need listener position translation for binaural decoding.

Enclosing my patch here. I would appreciate it if you could take a look!


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-----------end_max5_patcher-----------

Thank you,
Niki

Hello Niki,

Well, unfortunately I observe the same behaviour on my computer :
the BinauralVR Compass VST takes more than 40% per instance.
Therefore the patch cannot run with 3 instances.
I dont think I can further help here.
Try to reduce the number of instance or the HOA order (or other plugin parameters that may affect the CPU load) ??

Good luck,
T.