adicionando instrumentos no editor de patterns

assets/js/creations/pattern/pattern_state.js

@@ -26,7 +26,7 @@ export function initializePatternState() {
 
   appState.pattern.tracks = [];
   appState.pattern.activeTrackId = null;
-  appState.pattern.activePatternIndex = 0;
+  appState.pattern.activePatternIndex = null;
 }
 
 export async function loadAudioForTrack(track) {

assets/js/creations/pattern/pattern_ui.js

@@ -323,21 +323,30 @@ export function updateGlobalPatternSelector() {
     globalPatternSelector.innerHTML = ''; 
 
     if (referenceTrack && referenceTrack.patterns && referenceTrack.patterns.length > 0) {
-        referenceTrack.patterns.forEach((pattern, index) => {
-            const option = document.createElement('option');
-            option.value = index;
-            option.textContent = pattern.name; 
-            globalPatternSelector.appendChild(option);
-        });
+      const isFocused = !!appState.pattern.focusedBasslineId;
+      const hasSelection = Number.isInteger(appState.pattern.activePatternIndex);
 
-        if (isFocused) {
-          globalPatternSelector.value = appState.pattern.activePatternIndex || 0;
-        } else if (activeTrack) {
-          globalPatternSelector.value = activeTrack.activePatternIndex || 0;
-        } else {
-          globalPatternSelector.value = 0;
-        }
-        globalPatternSelector.disabled = false;
+      globalPatternSelector.innerHTML = '';
+
+      if (!isFocused && !hasSelection) {
+        const ph = document.createElement('option');
+        ph.value = '';
+        ph.textContent = 'Selecione uma pattern…';
+        ph.disabled = true;
+        ph.selected = true;
+        globalPatternSelector.appendChild(ph);
+      }
+
+      referenceTrack.patterns.forEach((pattern, index) => {
+        const option = document.createElement('option');
+        option.value = index;
+        option.textContent = pattern.name;
+        globalPatternSelector.appendChild(option);
+      });
+
+      // ✅ em vez de forçar 0
+      globalPatternSelector.value = hasSelection ? String(appState.pattern.activePatternIndex) : '';
+      globalPatternSelector.disabled = false;
     } else {
         const option = document.createElement('option');
         option.textContent = 'Sem patterns';