diff --git a/app/demo/index.html b/app/demo/index.html
index 2178436..f6fc1bf 100644
--- a/app/demo/index.html
+++ b/app/demo/index.html
@@ -337,12 +337,9 @@
 
   <span class="ctl-label">noise σ</span>
   <div class="segmented" role="radiogroup" aria-label="noise σ">
-    <label><input type="radio" name="j" value="0"><span>0.00</span></label>
-    <label><input type="radio" name="j" value="0.01" checked><span>0.01</span></label>
-    <label><input type="radio" name="j" value="0.05"><span>0.05</span></label>
-    <label><input type="radio" name="j" value="0.1"><span>0.10</span></label>
-    <label><input type="radio" name="j" value="0.15"><span>0.15</span></label>
-    <label><input type="radio" name="j" value="0.2"><span>0.20</span></label>
+    <label><input type="radio" name="j" value="0.001"><span>0.001</span></label>
+    <label><input type="radio" name="j" value="0.005" checked><span>0.005</span></label>
+    <label><input type="radio" name="j" value="0.01"><span>0.010</span></label>
   </div>
 
   <span class="ctl-label">n frames</span>
@@ -594,10 +591,8 @@ async function main() {
   }
   function updateContinue() {
     const btn = document.getElementById('continue-btn');
-    btn.disabled = !(selectedId && jitterScale > 0);
-    btn.title = !selectedId
-      ? 'pick a dataset first'
-      : (jitterScale <= 0 ? 'noise σ must be > 0 to simulate' : '');
+    btn.disabled = !selectedId;
+    btn.title = selectedId ? '' : 'pick a dataset first';
   }
 
   // Sample-count slider → cheap: just change draw range per geometry.