bug(audio): volume not applied — GainNode gain ignored after applyMix() called pre-gesture #39

Summary

Even when audio did play, volume changes from the mixer faders had no effect. All stems played at default gain regardless of fader position.

Root cause

applyMix() was called during canplay (before any user gesture), creating a GainNode on a suspended AudioContext. The gain was set, but the AudioContext never processed it correctly. On subsequent play events, the GainNode was already set with a stale/wrong gain value.

Fix

applyMix() lazily creates the GainNode only when ctx.state === "running" (i.e. after the user's first play gesture). Pre-gesture calls fall back to audioEl.volume.

Release

0.5.0-alpha.1