Fix ghost node SuperCollider playback: send frequency directly, apply octave adjustment, fix server error

webapp/path_navigator.html

@@ -1106,14 +1106,19 @@
                 // 1. Shift+click → SuperCollider (FIRST)
                 if (isShift) {
                     const endpoint = '/api/play-freq';
+                    const octave = parseInt(document.getElementById('octaveInput').value) || 0;
                     
-                    const requestBody = {
+                    // If ghost node with its own frequency, send directly; otherwise use chordIndex/nodeIndex
+                    const requestBody = node.data('frequency') ? {
+                        frequency: node.data('frequency'),
+                        octave: octave,
+                    } : {
                         chordIndex: chordIndex,
                         nodeIndex: localId,
-                        octave: parseInt(document.getElementById('octaveInput').value) || 0,
+                        octave: octave,
                     };
                     
-                    console.log('Sending to SuperCollider:', chordIndex, localId);
+                    console.log('Sending to SuperCollider:', node.data('frequency') ? 'direct frequency' : chordIndex + ',' + localId);
                     
                     fetch(endpoint, {
                         method: 'POST',

webapp/server.py

@@ -111,7 +111,24 @@ def play_freq():
     chord_index = data.get("chordIndex")
     node_index = data.get("nodeIndex")
     octave = data.get("octave", 0)
+    frequency_input = data.get("frequency")  # direct frequency for ghost nodes
 
+    # If frequency provided directly (ghost node), use it
+    if frequency_input is not None:
+        frequency = float(frequency_input) * (2**octave)
+        voice = 1  # Use voice 1 for ghost nodes
+        osc_sender.send_single(frequency, voice)
+
+        return jsonify(
+            {
+                "frequency": frequency,
+                "voice": voice,
+                "fundamental": fundamental,
+                "fraction": "ghost",
+            }
+        )
+
+    # Original node: calculate from chordIndex/nodeIndex
     if chord_index < 0 or chord_index >= len(chords):
         return jsonify({"error": "Invalid chord index"}), 400