Implement Phase 3 audio gaps: continuous beds (zocalo chatter, teletype chatter, heterodyne drone)

js/config.js

@@ -510,7 +510,8 @@ const UniverseRegistry = {
       { id: 'btn-chirp-single', label: 'ASTROGATOR BEAT' },
       { id: 'btn-chirp-sweep',  label: 'ANALOG GLISSANDO' },
       { id: 'btn-relay-click',  label: 'TAPE REEL SPOOL' },
-      { id: 'btn-tape-spooler', label: 'DUAL-REEL TAPE SPOOLER' }
+      { id: 'btn-tape-spooler', label: 'DUAL-REEL TAPE SPOOLER' },
+      { id: 'btn-hetero-drone', label: 'HETERO-DRONE TONE' }
     ],
     presets: {
       'ret-jupiter-2': {
@@ -903,6 +904,7 @@ const UniverseRegistry = {
       { id: 'btn-commlock',    label: 'COMMLOCK CALLING TONE' },
       { id: 'btn-sevas-spark', label: 'CONDUIT SPARK ARC' },
       { id: 'btn-station-ecg', label: 'CLINICAL VITAL (ECG)' },
+      { id: 'btn-zocalo-chatter', label: 'ZOCALO PLAZA CHATTER' },
       { id: 'btn-belter-telemetry', label: 'BELTER JURY-RIG TELEMETRY', span: 2 }
     ],
     presets: {