diff --git a/ashost.py b/ashost.py
index fa3f8f9..69218db 100644
--- a/ashost.py
+++ b/ashost.py
@@ -19,6 +19,12 @@ def match_device_name(input_name, output_list):
 
     return None
 
+def remove_through_ports(output_ports):
+    # Filter out ports containing "Through" in their names
+    filtered_ports = [port for port in output_ports if 'through' not in port.lower()]
+
+    return filtered_ports
+
 
 def determine_host(devices_in: list) -> str:
     master = None
@@ -133,14 +139,17 @@ def main_run():
     midi_host_in = determine_host(devices_in)
     print(midi_host_in)
 
+    devices_out_filtered = remove_through_ports(devices_out)
+
     # Find and remove the matching output device to avoid feedback
-    matching_output_device = match_device_name(midi_host_in, devices_out)
+    matching_output_device = match_device_name(midi_host_in, devices_out_filtered)
+    print("Filtering", matching_output_device)
 
     if matching_output_device:
-        devices_out.remove(matching_output_device)
+        devices_out_filtered.remove(matching_output_device)
 
     if midi_host_in:
-        relay_midi_host_to_out(midi_host_in, devices_out)
+        relay_midi_host_to_out(midi_host_in, devices_out_filtered)
 
 main_run()