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diff --git a/CONTEXT.md b/CONTEXT.md
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--- a/CONTEXT.md
+++ b/CONTEXT.md
@@ -47,3 +47,10 @@ holds no implementation decisions or specs (those live in `docs/adr/`).
 - **Pre-generation** — on first voice event for a user, synthesize all 6 event
   phrases (join/leave/deafen/undeafen/mute/unmute) with their display name and
   cache them. ~120ms first time, instant after. Lazy — no startup cost.
+
+## Music Playback
+
+- **Compressed playback** — `/grajcuj \w compressed`: downloads audio, runs
+  through the /compress pipeline (Opus 500bps, 12 kHz, mono → OGG), then
+  decodes the compressed file via symphonia for playback. Produces properly
+  destroyed audio via Opus codec, not just raw low-sample-rate PCM.