diff --git a/.vscode/settings.json b/.vscode/settings.json
index dfc0998..cb8749d 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -1,10 +1,11 @@
 {
-  "python.linting.flake8Enabled": true,
+  "python.formatting.provider": "black",
+  "editor.formatOnSave": true,
   "python.linting.enabled": true,
   "python.testing.pytestArgs": [
     "tests"
   ],
-  "python.testing.unittestEnabled": false,
-  "python.testing.nosetestsEnabled": false,
-  "python.testing.pytestEnabled": true
+  "python.testing.unittestEnabled": false,  
+  "python.testing.pytestEnabled": true,
+  "python.linting.flake8Enabled": true
 }
diff --git a/anthemav/protocol.py b/anthemav/protocol.py
index b6184e1..b137ec1 100755
--- a/anthemav/protocol.py
+++ b/anthemav/protocol.py
@@ -170,7 +170,17 @@
 
 COMMANDS_X20 = ["IDN", "ECH", "SIP", "Z1ARC", "FPB"]
 COMMANDS_X40 = ["PVOL", "WMAC", "EMAC", "IS1ARC", "GCFPB", "GCTXS"]
-COMMANDS_MDX_IGNORE = ["IDR"]
+COMMANDS_MDX_IGNORE = [
+    "IDR",
+    "Z1IRH",
+    "Z1IRV",
+    "Z1AIC",
+    "Z1BRT",
+    "Z1AIN",
+    "Z1DYN",
+    "Z1DIA",
+    "Z1ALM",
+]
 COMMANDS_MDX = ["MAC"]
 
 EMPTY_MAC = "00:00:00:00:00:00"
@@ -222,6 +232,7 @@ def __init__(
         self._last_command = ""
         self._deviceinfo_received = asyncio.Event()
         self._alm_number = {"None": 0}
+        self._available_input_numbers = []
         self.zones: Dict[int, Zone] = {1: Zone(self, 1)}
 
         for key in LOOKUP:
@@ -276,7 +287,7 @@ async def poweron_refresh(self):
             return
         else:
             await self.refresh_all()
-            await asyncio.sleep(2)
+            await asyncio.sleep(5)
             await self.poweron_refresh()
 
     async def refresh_all(self):
@@ -291,6 +302,9 @@ async def refresh_all(self):
         self.log.debug("refresh_all")
         # refresh main attribues
         await self.query_commands(LOOKUP)
+        if self._model_series == "mdx":
+            # MDX receivers don't returns the list of available input numbers and have a fixed list
+            self._populate_inputs(12)
 
     async def refresh_power(self):
         """Refresh power of all zones."""
@@ -398,7 +412,11 @@ def _populate_inputs(self, total):
             if self._model_series == "x40":
                 self.query(f"IS{input_number}IN")
             else:
-                self.query(f"ISN{input_number:02d}")
+                if (
+                    len(self._available_input_numbers) == 0
+                    or input_number in self._available_input_numbers
+                ):
+                    self.query(f"ISN{input_number:02d}")
 
     async def _parse_message(self, data: str):
         """Interpret each message datagram from device and do the needful.
@@ -638,10 +656,12 @@ def set_model_command(self, model: str):
     def set_zones(self, model: str):
         """Set zones for the appropriate objects."""
         number_of_zones: int = 0
-        if model == "MDX 16" or model == "MDA 16":
+        if model == "MDX16" or model == "MDA16":
             number_of_zones = 8
-        elif model == "MDX 8" or model == "MDA 8":
+        elif model == "MDX8" or model == "MDA8":
             number_of_zones = 4
+            # MDX 16 input number range is 1 to 12, but MDX 8 only have 1 to 4 and 9
+            self._available_input_numbers = [1, 2, 3, 4, 9]
         else:
             number_of_zones = 2
 
diff --git a/setup.py b/setup.py
index 054127a..144c2f2 100644
--- a/setup.py
+++ b/setup.py
@@ -11,7 +11,7 @@ def readme():
 
 setup(
     name="anthemav",
-    version="1.4.0",
+    version="1.4.0b2",
     author="David McNett",
     author_email="nugget@macnugget.org",
     url="https://github.com/nugget/python-anthemav",
diff --git a/tests/test_protocol.py b/tests/test_protocol.py
index d1f97ce..7b49a8a 100644
--- a/tests/test_protocol.py
+++ b/tests/test_protocol.py
@@ -85,23 +85,48 @@ async def test_zone_created_x40(self):
     async def test_zone_created_MDX8(self):
         avr = AVR()
         with patch.object(avr, "query"):
-            await avr._parse_message("IDMMDX 8")
+            await avr._parse_message("IDMMDX8")
             assert len(avr.zones) == 4
 
     async def test_zone_created_MDX16(self):
         avr = AVR()
         with patch.object(avr, "query"):
-            await avr._parse_message("IDMMDX 16")
+            await avr._parse_message("IDMMDX16")
+            assert len(avr.zones) == 8
+
+    async def test_zone_created_MDA16(self):
+        avr = AVR()
+        with patch.object(avr, "query"):
+            await avr._parse_message("IDMMDA16")
             assert len(avr.zones) == 8
 
     async def test_power_refreshed_MDX16(self):
         avr = AVR()
         with patch.object(avr, "query") as mock:
-            await avr._parse_message("IDMMDX 16")
+            await avr._parse_message("IDMMDX16")
             for zone in range(1, 9):
                 mock.assert_any_call(f"Z{zone}POW")
             assert call("Z9POW") not in mock.mock_calls
 
+    async def test_input_name_queried_for_MDX16(self):
+        avr = AVR()
+        with patch.object(avr, "query") as mock, patch.object(avr, "transport"):
+            await avr._parse_message("IDMMDX16")
+            await avr.refresh_all()
+            for input_number in range(1, 13):
+                mock.assert_any_call(f"ISN{input_number:02d}")
+
+    async def test_input_name_queried_for_MDX8(self):
+        avr = AVR()
+        with patch.object(avr, "query") as mock, patch.object(avr, "transport"):
+            await avr._parse_message("IDMMDX8")
+            await avr.refresh_all()
+            for input_number in range(1, 13):
+                if input_number in [1, 2, 3, 4, 9]:
+                    mock.assert_any_call(f"ISN{input_number:02d}")
+                else:
+                    assert call(f"ISN{input_number:02d}") not in mock.mock_calls
+
     async def test_pvol_x40(self):
         avr = AVR()
         with patch.object(avr, "query"):