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Everything that is presented in the Nodal Audio Space page applies both for surface and for volumetric matrix spaces.
Nodal-61 format can be considered as partial (surface only) but perfectly adapted to 99.99% (estimation!) of current world speakers devices.
But in our electroacoustic and acousmatic micro world, the 0.01 lasting percent may have a comparatively bigger importance because "the matter of spatial sound matters". Thus we can hope that full volumetric nodal audio spaces will be more widespread in the coming years...

Volumetric Nodal-75 space (and other Nodal-3D formats) is already possible to produce with most Open Channels and Direct Channels Acousmodules which support al least 75 channels... It can be either the N-75C (cubic cells) or the N-75D (diamond cells) version (read The Guide).
The only real difference with N-61 ecosystem is that there is even less compatible applications and plugins. Multitrack host which support 75 channels plugins and audio files with sufficient efficiency and ease is Reaper, so we're not going to complain either ;-)

Nodal-75 with cubic cells and with "diamond" cells
 

N-75, 5 x 5 x 3 matrix, cubic cells version
 

As for Nodal-100 versions with a fourth elevation layer (and Nodal-107 with a fifth), a few exist for my personal use, but this will have to wait until there is a real demand ;-)

Some of the plugins are separately available in their corresponding Advanced pages, but more are gathered in the bundle below.
To use them, just import the am64 or am3d "N-75" configuration file, or load the VSTPreset file which may be provided.
Attention: some of the config files import only the first 64 channels coordinates, thus you will have to place the 11 latest manually...
I will try to improve this later: N-75 configuration files.
 

As you can see, if it still lacks some tools like FFT based FX, most spatialization, effects and sampling/synthesis instruments are already available. The FastHelp documents available on the pages describe the 64 channels versions, but otherwise their features must be about the same.

Notes:
- some "75" versions have in reality more channels (76 or 78)
- plugins in italics will be integrated in the bundle later

Spatialization

- AnimaSpat 280
- MPESpat 880
- MultiMass 75
- ScaleMass 1675
- Spat3D 280
- SpatLayers 280
- SpatMass 875 / 1675
- SpatTouch 80
- ZoneShaper 76

Effects

- Distances 80
- FocusMass 76
- FocusPitch 75
- FocusShifter 75
- MassGrains 1675
- MassShaper 1678
- MiniDeco 75 (Direct Channels)
- MiniRez 75 (Direct Channels)
- Room 75
- SpatDelay 1675
- UniComp 80 (Direct Channels)
- UniGain 80 (Direct Channels)
- UniVerb 80 (Direct Channels)

Sampling

- AleaSampler 128 (Direct Channels)
- BrushPlayer 480
- MPESampler 880
- KaleidoSampler 128 (Direct Channels)
- MassSampler 875
- MultiSampler 75 (Direct Channels)
- RoomSampler 75
- SpatSampler 80
- SpatStrument AL78
- StretchSampler 75
- TouchPlayer 80 (Direct Channels)

Synthesis

- KaleidoSynth 128 (Direct Channels)
- MassSynth 1678

Utilities (Direct Channels)

- MultiLevels 80
- SimpleTest 80
- SpacedRoute 80
- SpacedView 128
- SpaceInFaders 80