diff --git a/ziffers/classes.py b/ziffers/classes.py
index 4d66e7f..0c51861 100644
--- a/ziffers/classes.py
+++ b/ziffers/classes.py
@@ -4,7 +4,7 @@ from itertools import product, islice, cycle
 import operator
 import random
 from .defaults import DEFAULT_OPTIONS
-from .scale import note_from_pc, midi_to_pitch_class
+from .scale import note_from_pc, midi_to_pitch_class, midi_to_freq
 
 
 @dataclass(kw_only=True)
@@ -99,12 +99,13 @@ class Pitch(Event):
     note: int = field(default=None)
     key: str = field(default=None)
     scale: str | list = field(default=None)
+    freq: float = field(default=None)
 
     def __post_init__(self):
         super().__post_init__()
         if self.text is None:
             self.text = str(self.pitch_class)
-            self.update_note()
+        self.update_note()
 
     def update_note(self):
         """Update note if Key, Scale and Pitch-class is present"""
@@ -121,7 +122,8 @@ class Pitch(Event):
                 modifier=self.modifier if self.modifier is not None else 0,
                 octave=self.octave if self.octave is not None else 0,
             )
-            self.set_note(note)
+            self.freq = midi_to_freq(note)
+            self.note = note
 
     def set_note(self, note: int) -> int:
         """Sets a note for the pitch and returns the note.
@@ -135,6 +137,9 @@ class Pitch(Event):
         self.note = note
         return note
 
+    def set_freq(self, freq: float):
+        self.freq = freq
+
     # pylint: disable=locally-disabled, unused-argument
     def get_value(self) -> int:
         """Returns the pitch class
@@ -323,20 +328,24 @@ class Sequence(Meta):
         Returns:
             dict: _description_
         """
-        if hasattr(current, "modifier"):
-            c_modifier = 0
-        elif "modifier" in options:
+        
+        if "modifier" in options:
             c_modifier = options["modifier"]
         else:
             c_modifier = 0
 
-        if hasattr(current, "octave"):
-            c_octave = 0
-        elif "octave" in options:
+        if hasattr(current, "modifier") and current.modifier is not None:
+            c_modifier += current.modifier
+
+
+        if "octave" in options:
             c_octave = options["octave"]
         else:
             c_octave = 0
 
+        if hasattr(current, "octave") and current.octave is not None:
+            c_octave += current.octave
+
         note = note_from_pc(
             root=options["key"],
             pitch_class=current.get_value(),
@@ -348,6 +357,7 @@ class Sequence(Meta):
             pitch_class=current.get_value(),
             text=str(current.get_value()),
             note=note,
+            freq=midi_to_freq(note),
             octave=c_octave,
             modifier=c_modifier,
             kwargs=options,
diff --git a/ziffers/defaults.py b/ziffers/defaults.py
index 14cdca3..1511435 100644
--- a/ziffers/defaults.py
+++ b/ziffers/defaults.py
@@ -41,7 +41,7 @@ DEFAULT_DURS = {
 
 DEFAULT_OCTAVE = 4
 
-DEFAULT_OPTIONS = {"octave": 0, "duration": 0.25}
+DEFAULT_OPTIONS = {"octave": 0, "duration": 0.25, "key":"C4", "scale":"IONIAN"}
 
 OPERATORS = {
     "+": operator.add,
diff --git a/ziffers/scale.py b/ziffers/scale.py
index 2d8f035..9b50c4d 100644
--- a/ziffers/scale.py
+++ b/ziffers/scale.py
@@ -44,6 +44,10 @@ def note_name_to_interval(name: str) -> int:
     interval = NOTES_TO_INTERVALS[values[0].capitalize()]
     return interval + modifier
 
+def midi_to_freq(note: int) -> float:
+    """Transform midi to frequency""" 
+    freq = 440 # Frequency of A
+    return (freq / 32) * (2 ** ((note - 9) / 12))
 
 def note_name_to_midi(name: str) -> int:
     """Parse note name to midi