Update manifest for SyntheticFX, SyntheticFXFree, Synthetic

manifests/SyntheticFX.json

@@ -90,6 +90,18 @@
       ],
       "manualUrl": "https://legitimatesounding.com/sv-modular/downloads/Whey.pdf"
     },
+    {
+      "slug": "Tuffet",
+      "name": "Tuffet",
+      "description": "Synthetic FX Tuffet",
+      "tags": [
+        "VCF",
+        "Effect",
+        "Digital",
+        "Polyphonic"
+      ],
+      "manualUrl": "https://legitimatesounding.com/sv-modular/downloads/Tuffet.pdf"
+    },
     {
       "slug": "Mix",
       "name": "Mix",