Changes to be committed:

modified:   data/www/index.html
	new file:   data/www/spectrum.html
	new file:   partitions.csv
	modified:   platformio.ini
	deleted:    src/NoteMappings copy.h
	modified:   src/main.cpp
	modified:   src/web_server.cpp
	modified:   src/web_server.h

data/www/index.html

@@ -67,7 +67,8 @@
             dashboard: '/dashboard.html',
             wifi: '/wifi.html',
             midi: '/midi.html',
-            system: '/system.html'
+            system: '/system.html',
+            spectrum: '/spectrum.html' // Added spectrum page
         };
 
         document.querySelectorAll('.menu-item').forEach(item => {
@@ -79,6 +80,19 @@
             });
         });
 
+        // Add spectrum menu item
+        const spectrumMenuItem = document.createElement('div');
+        spectrumMenuItem.className = 'menu-item';
+        spectrumMenuItem.dataset.page = 'spectrum';
+        spectrumMenuItem.textContent = 'Spectrum';
+        document.querySelector('.sidemenu').appendChild(spectrumMenuItem);
+
+        spectrumMenuItem.addEventListener('click', () => {
+            document.querySelectorAll('.menu-item').forEach(i => i.classList.remove('active'));
+            spectrumMenuItem.classList.add('active');
+            document.getElementById('contentFrame').src = pages.spectrum;
+        });
+
         // Load dashboard by default
         document.getElementById('contentFrame').src = pages.dashboard;
     </script>