Panner — `GDVP_NODE_PANNER` ✅

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Constant-power stereo placement with EMA-smoothed, artifact-free sweeps. Source: gdvp_dsp_panner.c, payload gdvp_node_panner_t in gdvp_nodes.h.

Signal & ports

Audio in (port 0): mono signal to place.
Output: stereo (the panner writes the left/right pair into contiguous bus routing).

Parameters

Parameter	Param ID / patch key	Range	Meaning
Pan position	`GDVP_PARAM_PAN_CV` (CC 10) / patch `pan`	0–16383	`0` = hard left, `8192` = centre, `16383` = hard right
Pan law	`GDVP_PARAM_PAN_LAW` / patch `pan_law`	0/1	`0` = Linear, `1` = Constant-power (−3 dB centre)

Behaviour notes

Constant-power vs linear

With constant-power law the perceived loudness stays even as you sweep across the field (the −3 dB centre pan law), using a branchless sine/cosine extraction via a phase offset — no runtime trig. Linear law is a straight amplitude crossfade (centre is louder), occasionally useful for hard-panned mono sources.

Smoothed sweeps

Pan position is smoothed in Q16.16 (smoothed_pan) toward the 14-bit target with an ema_shift-controlled rate, so automated pan moves and LFO-driven auto-pan are free of zipper artifacts.

Usually the last node in a voice, fed by the VCA.
The summed stereo result is what the Global EFX bus and master output receive.