diff --git a/src/web/server.py b/src/web/server.py
index 361f1d6..2b380d4 100644
--- a/src/web/server.py
+++ b/src/web/server.py
@@ -1533,6 +1533,59 @@ class WebServer:
                 "restarted": True,
             }
 
+        # ── Generic settings persistence ──────────────────────────
+
+        KEY_MAP = {
+            "input_device": ("audio", "input_device"),
+            "output_device": ("audio", "output_device"),
+            "channel_mode": ("audio", "mode"),
+            "input_pad": ("audio", "input_pad"),
+            "input_impedance": ("audio", "input_impedance"),
+            "midi_channel": ("midi", "channel"),
+            "midi_clock": ("midi", "clock"),
+            "midi_thru": ("midi", "thru"),
+            "auto_dim": ("display", "auto_dim"),
+            "screen_saver": ("display", "screen_saver"),
+            "tap_tempo": ("tempo", "tap_tempo"),
+            "tempo_division": ("tempo", "division"),
+            "tap_tempo_mute": ("tempo", "mute_on_tap"),
+        }
+
+        @app.post("/api/settings")
+        async def save_settings(data: dict):
+            """Save arbitrary settings to config.yaml.
+
+            Accepts a dict of key-value pairs.  Each key is mapped to
+            the correct ``section.key`` in ``~/.pedal/config.yaml`` and
+            persisted immediately.
+
+            Special handling:
+              ``brightness`` — UI sends 1–10, stored as 0.1–1.0 float.
+            """
+            if self.deps.config is None:
+                raise HTTPException(status_code=503, detail="Config not available")
+
+            cfg = self.deps.config
+            n_saved = 0
+
+            for key, val in data.items():
+                if key == "brightness":
+                    leds = cfg.setdefault("leds", {})
+                    if isinstance(val, (int, float)) and val >= 1:
+                        leds["brightness"] = val / 10.0
+                    else:
+                        leds["brightness"] = val
+                    n_saved += 1
+                elif key in KEY_MAP:
+                    section, skey = KEY_MAP[key]
+                    cfg.setdefault(section, {})[skey] = val
+                    n_saved += 1
+
+            save_config(cfg, self.deps.config_path)
+            logger.info("Settings saved: %d keys from %s", n_saved, data)
+
+            return {"ok": True, "saved": n_saved}
+
         # ── FX block param schemas ───────────────────────────────
 
         @app.get("/api/block-params/{fx_type}")