That's a MCJ (Morph-Controlled Joint), not a JCM (Joint-Controlled Morph), Shante.

JCMs are used to fix shapes of when a joint bends. For instance, before weight-mapped rigging came, if you wanted an elbow to be pointy upon bending, you most likely needed a morph for that, activated by the bend itself.

V4 has a bazillion JCMs, plus magnets controlled by joint rotations as well.

Non-WM Antonia has a few JCMs too.

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Feel free to call me Ohki!

Poser Pro 11, Poser 12 and Poser 13, Windows 10, Superfly junkie. My units are milimeters.

Persephone (the computer): AMD Ryzen 9 5900x, RTX 3070 GPU, 96gb ram.