diff --git a/examples/midi/main.rb b/examples/midi/main.rb
index c9d7aef..70fa4ac 100644
--- a/examples/midi/main.rb
+++ b/examples/midi/main.rb
@@ -14,7 +14,7 @@ class Main
   end
 
   def on_update(event)
-    if event == "midi"
+    if event == :midi
       current = @vm.midi.current
       midi_handler(current, @vm.midi.get(current))
     end
diff --git a/lib/voicemeeter/event.rb b/lib/voicemeeter/event.rb
index 9ff9091..2af4fc2 100644
--- a/lib/voicemeeter/event.rb
+++ b/lib/voicemeeter/event.rb
@@ -18,9 +18,9 @@ module Voicemeeter
       private def trigger(event)
         callbacks.each do |callback|
           if callback.is_a? Method
-            callback.call if callback.name == event
+            callback.call if callback.name == "on_#{event}".to_sym
           elsif callback.respond_to? :on_update
-            callback.on_update event.to_s[3..]
+            callback.on_update event
           end
         end
       end
diff --git a/lib/voicemeeter/worker.rb b/lib/voicemeeter/worker.rb
index 58d8b7b..d48d33d 100644
--- a/lib/voicemeeter/worker.rb
+++ b/lib/voicemeeter/worker.rb
@@ -35,15 +35,15 @@ module Voicemeeter
             logger.debug "closing #{Thread.current.name} thread"
             break
           end
-          trigger :on_pdirty if e_from_que == :pdirty && pdirty?
-          trigger :on_mdirty if e_from_que == :mdirty && mdirty?
-          trigger :on_midi if e_from_que == :midi && get_midi_message
+          trigger :pdirty if e_from_que == :pdirty && pdirty?
+          trigger :mdirty if e_from_que == :mdirty && mdirty?
+          trigger :midi if e_from_que == :midi && get_midi_message
           if e_from_que == :ldirty && ldirty?
             cache[:strip_comp] = cache[:strip_level].zip(cache[:strip_buf]).map { |a, b| a != b }
             cache[:bus_comp] = cache[:bus_level].zip(cache[:bus_buf]).map { |a, b| a != b }
             cache[:strip_level] = cache[:strip_buf]
             cache[:bus_level] = cache[:bus_buf]
-            trigger :on_ldirty
+            trigger :ldirty
           end
         end
       end