diff --git a/docker/frontend/shared/utils/paramDefs.ts b/docker/frontend/shared/utils/paramDefs.ts
index 464fa79..133cad8 100644
--- a/docker/frontend/shared/utils/paramDefs.ts
+++ b/docker/frontend/shared/utils/paramDefs.ts
@@ -105,6 +105,30 @@ export const PARAM_DEFS: {
       get: (a) => a.shadow ?? 0,
       set: (v) => ({ shadow: v }),
     },
+    {
+      // The end points of the tone curve: WHITE lifts/crushes the top, BLACK the
+      // toe. Same range as the CREATE form's rows, so a look round-trips.
+      key: 'whites',
+      label: 'WHITE',
+      min: -10,
+      max: 10,
+      step: 1,
+      defaultValue: 0,
+      display: sign,
+      get: (a) => a.whites ?? 0,
+      set: (v) => ({ whites: v }),
+    },
+    {
+      key: 'blacks',
+      label: 'BLACK',
+      min: -10,
+      max: 10,
+      step: 1,
+      defaultValue: 0,
+      display: sign,
+      get: (a) => a.blacks ?? 0,
+      set: (v) => ({ blacks: v }),
+    },
   ],
   wb: [
     {