Chapter 4 of 9

Host

Ask the DAW how many channels and what sample rate the plugin sees — then size I/O and UI labels to match.

Host queries

const sr = wax.host.sampleRate();
const block = wax.host.blockSize();
const ins = wax.host.inputChannels();   // 1 or 2 typical
const outs = wax.host.outputChannels();

Routing

FX: use wax.in({ channel: 0 }) / 1 up to ins - 1. Mono tracks often only energize channel 0.
Synths: usually ignore inputs; still call outputChannels() if you render mono vs stereo deliberately.
Browser preview: host fields reflect the Web Audio path (still useful for layout); bridge fields match the real plugin when WaxNative.hasBridge() is true.

When to read host info

After await WaxNative.create(), before the first render. Re-read only if you handle dynamic I/O changes (uncommon on Custom Pages).

Try it

Transport timing and playhead APIs live on WaxWeb for Web Audio apps; native graphs use Transport callbacks and engine nodes instead.

Example code

Snippets from this lesson — combine in your Custom Page.

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