GDVP Mixer
Mixer — GDVP_NODE_MIXER ✅ (usually auto-injected)
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A multi-input summing bus with per-input and master gain. In normal use you don't place it
yourself — the DAG compiler inserts a mixer automatically
whenever more than one edge fans into the same input port. You can also place one explicitly in a
.gvp (the example patches do, e.g. organic_pad_reverb). Source: gdvp_dsp_mixer.c, payload
gdvp_node_mixer_t in gdvp_nodes.h.
Signal & ports
- Inputs: up to 6 sources, summed.
- Output (port 0): the mix.
Parameters
| Parameter | Param ID / patch key | Range | Meaning |
|---|---|---|---|
| Master gain | GDVP_PARAM_MIXER_MASTER_GAIN (CC 87) / patch master_gain |
0–16383 | Output level of the mix, EMA-smoothed |
| Input gain 0–5 | GDVP_PARAM_MIXER_INPUT_GAIN_0…5 (CC 88–90 + …) / patch input_*_gain |
0–16383 | Per-input level |
| Mute | GDVP_PARAM_MIXER_MUTE |
0/1 | Silence the mix output |
| Input count | (node input_count) |
1–6 | Active inputs (set by the compiler when auto-injected) |
Patch files name the per-input gains positionally (
input_a_gain,input_b_gain, …). The engine exposes six numbered input-gain parameter IDs for live/MIDI control.
Behaviour notes
- Auto-injection. When you wire three oscillators into one filter input, the compiler places a mixer in front of the filter and routes the three sources through it. The patch's post-compilation edge list (what the front panel draws) will show the injected mixer even though you didn't add it. See DAG §2.3.
- Integer-only smoothing. Master gain is Q16.16 EMA-smoothed (
ema_shift), so level changes don't zipper. - Bounded. Six inputs maximum, fixed 28-byte state — consistent with the no-allocation rule.
Related
- DAG: auto-injected nodes explains when and why a mixer appears.