diff --git a/smnp/module/synth/function/synth.py b/smnp/module/synth/function/synth.py
index 625887d..0c6c834 100644
--- a/smnp/module/synth/function/synth.py
+++ b/smnp/module/synth/function/synth.py
@@ -1,25 +1,13 @@
-from smnp.function.model import CombinedFunction, Function
-from smnp.function.signature import varargSignature
-from smnp.module.synth.lib.player import playNotes
+from smnp.function.model import Function
+from smnp.function.signature import signature
+from smnp.module.synth.lib.player import play
 from smnp.type.model import Type
-from smnp.type.signature.matcher.list import listOf
-from smnp.type.signature.matcher.type import ofTypes
+from smnp.type.signature.matcher.type import ofType
 
-_signature1 = varargSignature(ofTypes(Type.NOTE, Type.INTEGER))
-def _function1(env, vararg):
-    notes = [arg.value for arg in vararg]
+_signature = signature(ofType(Type.NOTE))
+def _function(env, note):
     bpm = env.findVariable('bpm')
-    playNotes(notes, bpm.value)
+    play(note.value, bpm.value)
 
 
-_signature2 = varargSignature(listOf(Type.NOTE, Type.INTEGER))
-def _function2(env, vararg):
-    for arg in vararg:
-        _function1(env, arg.value)
-
-
-function = CombinedFunction(
-    'synth',
-    Function(_signature1, _function1),
-    Function(_signature2, _function2)
-)
+function = Function(_signature, _function, 'synthNote')
\ No newline at end of file
diff --git a/smnp/note/pitch.py b/smnp/note/pitch.py
index fb757b5..3fa5e77 100644
--- a/smnp/note/pitch.py
+++ b/smnp/note/pitch.py
@@ -44,7 +44,7 @@ class NotePitch(Enum):
         if string.lower() in stringToPitch:
             return stringToPitch[string.lower()]
 
-        if string.upper() in NotePitch:
+        if string.upper() in NotePitch.__members__:
             return NotePitch[string.upper()]
 
         raise NoteException(f"Note '{string}' does not exist")