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app.js

@@ -125,6 +125,7 @@ const midiBpmModeButtons = midiBpmModeGroup ? midiBpmModeGroup.querySelectorAll(
 let midiSeedActive = false;
 let bachSeedActive = false;
 let bachSymphonyActive = true;
+let bachSymphony2HandActive = false;
 let midiBpmMode = "lock";
 let midiTokens = [];
 let midiStartBar = 0;
@@ -783,7 +784,8 @@ async function start() {
       midiStartBar: midiStartBar,
       midiBpmMode: midiBpmMode,
       bachSeedActive: bachSeedActive,
-      bachSymphonyActive: bachSymphonyActive
+      bachSymphonyActive: bachSymphonyActive,
+      bachSymphony2HandActive: bachSymphony2HandActive
     });
   });
   
@@ -1491,21 +1493,31 @@ toggleButtons.forEach(btn => {
       midiSeedControls.style.display = "block";
       bachSeedActive = false;
       bachSymphonyActive = false;
+      bachSymphony2HandActive = false;
     } else if (value === "bach") {
       midiSeedActive = false;
       midiSeedControls.style.display = "none";
       bachSeedActive = true;
       bachSymphonyActive = false;
+      bachSymphony2HandActive = false;
     } else if (value === "bach_symphony") {
       midiSeedActive = false;
       midiSeedControls.style.display = "none";
       bachSeedActive = false;
       bachSymphonyActive = true;
+      bachSymphony2HandActive = false;
+    } else if (value === "bach_symphony_2hand") {
+      midiSeedActive = false;
+      midiSeedControls.style.display = "none";
+      bachSeedActive = false;
+      bachSymphonyActive = false;
+      bachSymphony2HandActive = true;
     } else {
       midiSeedActive = false;
       midiSeedControls.style.display = "none";
       bachSeedActive = false;
       bachSymphonyActive = false;
+      bachSymphony2HandActive = false;
     }
   });
 });

index.html

@@ -191,6 +191,7 @@
               <button type="button" class="toggle-btn" data-value="midi">Start from MIDI</button>
               <button type="button" class="toggle-btn" data-value="bach">Bach</button>
               <button type="button" class="toggle-btn active" data-value="bach_symphony">Grand Symphony</button>
+              <button type="button" class="toggle-btn" data-value="bach_symphony_2hand">Grand Symphony (2-Hand)</button>
             </div>
             
             <!-- MIDI Seeding Controls (Expandable if active) -->

worker.js

@@ -33,6 +33,7 @@ let midiTokens = [];
 let midiStartBar = 0;
 let isWarmingUp = false;
 let bachSymphonyActive = false;
+let bachSymphony2HandActive = false;
 
 // Temporal queues for gathering parsed events
 let tempQueue = [];
@@ -335,6 +336,83 @@ async function warmPrompt() {
       "NOTE_74", "DUR_32", "VEL_7",
       "BAR"
     ];
+  } else if (bachSymphony2HandActive) {
+    allTokensStr = [
+      "BOS", "BPM_120", "GRID_64",
+      "BAR",
+      // Bar 1: J.S. Bach Cantata 29 Sinfonia theme (Preludio transposed to D Major) with Left-Hand Bass
+      "POS_0", 
+      "NOTE_38", "DUR_16", "VEL_6", // LH octaves
+      "NOTE_50", "DUR_16", "VEL_6",
+      "NOTE_74", "DUR_4", "VEL_6",  // RH arpeggio
+      "POS_4", "NOTE_69", "DUR_4", "VEL_6",
+      "POS_8", "NOTE_66", "DUR_4", "VEL_6",
+      "POS_12", "NOTE_69", "DUR_4", "VEL_6",
+      "POS_16", 
+      "NOTE_42", "DUR_16", "VEL_6", // LH octaves
+      "NOTE_54", "DUR_16", "VEL_6",
+      "NOTE_74", "DUR_4", "VEL_6",  // RH arpeggio
+      "POS_20", "NOTE_69", "DUR_4", "VEL_6",
+      "POS_24", "NOTE_66", "DUR_4", "VEL_6",
+      "POS_28", "NOTE_69", "DUR_4", "VEL_6",
+      "POS_32", 
+      "NOTE_45", "DUR_16", "VEL_6", // LH octaves
+      "NOTE_57", "DUR_16", "VEL_6",
+      "NOTE_74", "DUR_4", "VEL_6",  // RH arpeggio
+      "POS_36", "NOTE_76", "DUR_4", "VEL_6",
+      "POS_40", "NOTE_78", "DUR_4", "VEL_6",
+      "POS_44", "NOTE_79", "DUR_4", "VEL_6",
+      "POS_48", 
+      "NOTE_38", "DUR_16", "VEL_6", // LH octaves
+      "NOTE_50", "DUR_16", "VEL_6",
+      "NOTE_81", "DUR_4", "VEL_6",  // RH arpeggio
+      "POS_52", "NOTE_83", "DUR_4", "VEL_6",
+      "POS_56", "NOTE_85", "DUR_4", "VEL_6",
+      "POS_60", "NOTE_86", "DUR_4", "VEL_6",
+      "BAR",
+      // Bar 2: Harmonic response (A Major context) with Left-Hand Bass
+      "POS_0", 
+      "NOTE_45", "DUR_16", "VEL_6", // LH octaves
+      "NOTE_57", "DUR_16", "VEL_6",
+      "NOTE_73", "DUR_4", "VEL_6",  // RH arpeggio
+      "POS_4", "NOTE_69", "DUR_4", "VEL_6",
+      "POS_8", "NOTE_64", "DUR_4", "VEL_6",
+      "POS_12", "NOTE_69", "DUR_4", "VEL_6",
+      "POS_16", 
+      "NOTE_49", "DUR_16", "VEL_6", // LH octaves
+      "NOTE_61", "DUR_16", "VEL_6",
+      "NOTE_73", "DUR_4", "VEL_6",  // RH arpeggio
+      "POS_20", "NOTE_69", "DUR_4", "VEL_6",
+      "POS_24", "NOTE_64", "DUR_4", "VEL_6",
+      "POS_28", "NOTE_69", "DUR_4", "VEL_6",
+      "POS_32", 
+      "NOTE_40", "DUR_16", "VEL_6", // LH octaves
+      "NOTE_52", "DUR_16", "VEL_6",
+      "NOTE_73", "DUR_4", "VEL_6",  // RH arpeggio
+      "POS_36", "NOTE_74", "DUR_4", "VEL_6",
+      "POS_40", "NOTE_76", "DUR_4", "VEL_6",
+      "POS_44", "NOTE_78", "DUR_4", "VEL_6",
+      "POS_48", 
+      "NOTE_45", "DUR_16", "VEL_6", // LH octaves
+      "NOTE_57", "DUR_16", "VEL_6",
+      "NOTE_79", "DUR_4", "VEL_6",  // RH arpeggio
+      "POS_52", "NOTE_81", "DUR_4", "VEL_6",
+      "POS_56", "NOTE_83", "DUR_4", "VEL_6",
+      "POS_60", "NOTE_85", "DUR_4", "VEL_6",
+      "BAR",
+      // Bar 3: Grand D Major Symphonic Chord resolution (2-hand massive layout)
+      "POS_0", 
+      "NOTE_26", "DUR_32", "VEL_7", // Low D1 & D2
+      "NOTE_38", "DUR_32", "VEL_7",
+      "NOTE_50", "DUR_32", "VEL_7", // Right hand layout
+      "NOTE_54", "DUR_32", "VEL_7",
+      "NOTE_57", "DUR_32", "VEL_7",
+      "NOTE_62", "DUR_32", "VEL_7",
+      "NOTE_66", "DUR_32", "VEL_7",
+      "NOTE_69", "DUR_32", "VEL_7",
+      "NOTE_74", "DUR_32", "VEL_7",
+      "BAR"
+    ];
   } else {
     allTokensStr = ["BOS", "BPM_120", "GRID_64", "BAR", "POS_0"];
   }
@@ -411,6 +489,7 @@ self.onmessage = async function (e) {
         midiBpmMode = data.midiBpmMode || "lock";
         bachSeedActive = data.bachSeedActive || false;
         bachSymphonyActive = data.bachSymphonyActive || false;
+        bachSymphony2HandActive = data.bachSymphony2HandActive || false;
         
         parser = makeParser();
         parser.reset();