diff --git a/.github/workflows/pythonpublish.yml b/.github/workflows/pythonpublish.yml
index 945f35b..678b180 100644
--- a/.github/workflows/pythonpublish.yml
+++ b/.github/workflows/pythonpublish.yml
@@ -5,10 +5,15 @@ on:
     types: [published]
   workflow_dispatch:
     
-
+permissions:
+  contents: read
+  id-token: write
+  
 jobs:
   deploy:
     runs-on: ubuntu-latest
+    environment:
+      name: release
     steps:
     - uses: actions/checkout@v3.5.2
     - name: Set up Python
@@ -18,14 +23,11 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install setuptools build wheel twine
-    - name: Build and publish
-      env:
-        TWINE_USERNAME: __token__
-        TWINE_PASSWORD: ${{ secrets.PYPI_APIKEY }}
-      run: |
-        python -m build .
-        twine upload dist/*
+        pip install build
+    - name: Build package
+      run: python -m build
+    - name: pypi-publish
+      uses: pypa/gh-action-pypi-publish@v1.8.6
     - name: Report to Mastodon
       uses: cbrgm/mastodon-github-action@v1.0.1
       with:
diff --git a/docs/source/conf.py b/docs/source/conf.py
index 708e879..01ca47d 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -15,18 +15,19 @@
 import os
 import sys
 sys.path.insert(0, os.path.abspath('../..'))
-print(sys.path)
+
+import pycmx
 
 # -- Project information -----------------------------------------------------
 
 project = u'pycmx'
-copyright = u'2022, Jamie Hardt'
+copyright = u'(c) 2023, Jamie Hardt'
 author = u'Jamie Hardt'
 
 # The short X.Y version
-version = u''
+version = pycmx.__version__
 # The full version, including alpha/beta/rc tags
-release = u''
+release = pycmx.__version__
 
 
 # -- General configuration ---------------------------------------------------
diff --git a/pycmx/__init__.py b/pycmx/__init__.py
index 4a20f1c..80e4951 100644
--- a/pycmx/__init__.py
+++ b/pycmx/__init__.py
@@ -1,14 +1,13 @@
 # -*- coding: utf-8 -*-
 """
-pycmx is a module for parsing CMX 3600-style EDLs. For more information and
-examples see README.md
+pycmx is a parser for CMX 3600-style EDLs.
 
-This module (c) 2022 Jamie Hardt. For more information on your rights to
+This module (c) 2023 Jamie Hardt. For more information on your rights to
 copy and reuse this software, refer to the LICENSE file included with the
 distribution.
 """
 
-__version__ = '1.2.0'
+__version__ = '1.2.1'
 
 from .parse_cmx_events import parse_cmx3600
 from .transition import Transition
diff --git a/pycmx/channel_map.py b/pycmx/channel_map.py
index a7071ef..f52cc4f 100644
--- a/pycmx/channel_map.py
+++ b/pycmx/channel_map.py
@@ -2,7 +2,7 @@
 # (c) 2018 Jamie Hardt
 
 from re import (compile, match)
-from typing import Dict, Tuple
+from typing import Dict, Tuple, Generator
 
 class ChannelMap:
     """
@@ -24,62 +24,62 @@ class ChannelMap:
         self.v = v
 
     @property
-    def video(self):
+    def video(self) -> bool:
         'True if video is included'
         return self.v
 
     @property
-    def audio(self):
+    def audio(self) -> bool:
         'True if an audio channel is included'
         return len(self._audio_channel_set) > 0
 
     @property
-    def channels(self):
+    def channels(self) -> Generator[int, None, None]:
         'A generator for each audio channel'
         for c in self._audio_channel_set:
             yield c
 
     @property
-    def a1(self):
+    def a1(self) -> bool:
         """True if A1 is included"""
         return self.get_audio_channel(1)
 
     @a1.setter
-    def a1(self,val):
+    def a1(self, val: bool):
         self.set_audio_channel(1,val)
 
     @property
-    def a2(self):
+    def a2(self) -> bool:
         """True if A2 is included"""
         return self.get_audio_channel(2)
 
     @a2.setter
-    def a2(self,val):
+    def a2(self, val: bool):
         self.set_audio_channel(2,val)
 
     @property
-    def a3(self):
+    def a3(self) -> bool:
         """True if A3 is included"""
         return self.get_audio_channel(3)
 
     @a3.setter
-    def a3(self,val):
+    def a3(self, val: bool):
         self.set_audio_channel(3,val)
     
     @property
-    def a4(self):
+    def a4(self) -> bool:
         """True if A4 is included"""
         return self.get_audio_channel(4)
 
     @a4.setter
-    def a4(self,val):
+    def a4(self,val: bool):
         self.set_audio_channel(4,val)
 
-    def get_audio_channel(self,chan_num):
+    def get_audio_channel(self, chan_num) -> bool:
         """True if chan_num is included"""
         return (chan_num in self._audio_channel_set)
 
-    def set_audio_channel(self,chan_num,enabled):
+    def set_audio_channel(self,chan_num, enabled: bool):
         """If enabled is true, chan_num will be included"""
         if enabled:
             self._audio_channel_set.add(chan_num)
diff --git a/pycmx/edit.py b/pycmx/edit.py
index bbbbab3..3f60b3c 100644
--- a/pycmx/edit.py
+++ b/pycmx/edit.py
@@ -3,7 +3,9 @@
 
 from .transition import Transition
 from .channel_map import ChannelMap
-from .parse_cmx_statements import StmtEffectsName
+# from .parse_cmx_statements import StmtEffectsName
+
+from typing import Optional
 
 class Edit:
     """
@@ -18,7 +20,7 @@ class Edit:
         self.trans_name_statement = trans_name_statement 
 
     @property
-    def line_number(self):
+    def line_number(self) -> int:
         """
         Get the line number for the "standard form" statement associated with
         this edit. Line numbers a zero-indexed, such that the 
@@ -27,7 +29,7 @@ class Edit:
         return self.edit_statement.line_number
 
     @property
-    def channels(self):
+    def channels(self) -> ChannelMap:
         """
         Get the :obj:`ChannelMap` object associated with this Edit.
         """
@@ -38,7 +40,7 @@ class Edit:
         return cm
 
     @property
-    def transition(self):
+    def transition(self) -> Transition:
         """
         Get the :obj:`Transition` object associated with this edit.
         """
@@ -48,14 +50,14 @@ class Edit:
             return Transition(self.edit_statement.trans, self.edit_statement.trans_op, None)
     
     @property
-    def source_in(self):
+    def source_in(self) -> str:
         """
         Get the source in timecode.
         """
         return self.edit_statement.source_in
 
     @property
-    def source_out(self):
+    def source_out(self) -> str:
         """
         Get the source out timecode.
         """
@@ -63,7 +65,7 @@ class Edit:
         return self.edit_statement.source_out
 
     @property
-    def record_in(self):
+    def record_in(self) -> str:
         """
         Get the record in timecode.
         """
@@ -71,7 +73,7 @@ class Edit:
         return self.edit_statement.record_in
 
     @property
-    def record_out(self):
+    def record_out(self) -> str:
         """
         Get the record out timecode.
         """
@@ -79,7 +81,7 @@ class Edit:
         return self.edit_statement.record_out
 
     @property
-    def source(self):
+    def source(self) -> str:
         """
         Get the source column. This is the 8, 32 or 128-character string on the
         event record line, this usually references the tape name of the source.
@@ -87,21 +89,21 @@ class Edit:
         return self.edit_statement.source
 
     @property
-    def black(self):
+    def black(self) -> bool:
         """
         Black video or silence should be used as the source for this event.
         """
         return self.source == "BL"
 
     @property
-    def aux_source(self):
+    def aux_source(self) -> bool:
         """
         An auxiliary source is the source of this event.
         """
         return self.source == "AX"
 
     @property
-    def source_file(self):
+    def source_file(self) -> Optional[str]:
         """
         Get the source file, as attested by a "* SOURCE FILE" remark on the
         EDL. This will return None if the information is not present.
@@ -112,7 +114,7 @@ class Edit:
             return self.source_file_statement.filename
 
     @property
-    def clip_name(self):
+    def clip_name(self) -> Optional[str]:
         """
         Get the clip name, as attested by a "* FROM CLIP NAME" or "* TO CLIP 
         NAME" remark on the EDL. This will return None if the information is
diff --git a/pycmx/edit_list.py b/pycmx/edit_list.py
index a8c27f8..b126b69 100644
--- a/pycmx/edit_list.py
+++ b/pycmx/edit_list.py
@@ -5,21 +5,21 @@ from .parse_cmx_statements import (StmtUnrecognized, StmtFCM, StmtEvent, StmtSou
 from .event import Event
 from .channel_map import ChannelMap
 
+from typing import Generator
+
 class EditList:
     """
-    Represents an entire edit decision list as returned by `parse_cmx3600()`.
-    
+    Represents an entire edit decision list as returned by :func:`~pycmx.parse_cmx3600()`.
     """
     def __init__(self, statements):
         self.title_statement = statements[0]
         self.event_statements = statements[1:]
 
-    
     @property
-    def format(self):
+    def format(self) -> str:
         """
-        The detected format of the EDL. Possible values are: `3600`,`File32`,
-        `File128`, and `unknown`
+        The detected format of the EDL. Possible values are: "3600", "File32",
+        "File128", and "unknown".
         """
         first_event = next( (s for s in self.event_statements if type(s) is StmtEvent), None)
 
@@ -37,7 +37,7 @@ class EditList:
         
 
     @property
-    def channels(self):
+    def channels(self) -> ChannelMap:
         """
         Return the union of every channel channel.
         """
@@ -51,7 +51,7 @@ class EditList:
         
 
     @property
-    def title(self):
+    def title(self) -> str:
         """
         The title of this edit list.
         """
@@ -59,7 +59,7 @@ class EditList:
 
     
     @property
-    def unrecognized_statements(self):
+    def unrecognized_statements(self) -> Generator[StmtUnrecognized, None, None]:
         """
         A generator for all the unrecognized statements in the list.
         """
@@ -69,7 +69,7 @@ class EditList:
         
 
     @property
-    def events(self):
+    def events(self) -> Generator[Event, None, None]:
         'A generator for all the events in the edit list'
         is_drop = None
         current_event_num = None
@@ -97,7 +97,7 @@ class EditList:
         yield Event(statements=event_statements)
 
     @property
-    def sources(self):
+    def sources(self) -> Generator[StmtSourceUMID, None, None]:
         """
         A generator for all of the sources in the list
         """
diff --git a/pycmx/event.py b/pycmx/event.py
index f43e8f8..3ff0df7 100644
--- a/pycmx/event.py
+++ b/pycmx/event.py
@@ -1,26 +1,28 @@
 # pycmx
-# (c) 2018 Jamie Hardt
+# (c) 2023 Jamie Hardt
 
 from .parse_cmx_statements import (StmtEvent, StmtClipName, StmtSourceFile, StmtAudioExt, StmtUnrecognized, StmtEffectsName)
-from .edit import Edit
+from .edit import Edit 
+
+from typing import List, Generator, Optional, Tuple, Any
 
 class Event:
     """
-    Represents a collection of :class:`Edit`s, all with the same event number.
+    Represents a collection of :class:`~pycmx.edit.Edit` s, all with the same event number.
     """
 
     def __init__(self, statements):
         self.statements = statements
     
     @property
-    def number(self):
+    def number(self) -> int:
         """
         Return the event number.
         """
         return int(self._edit_statements()[0].event)
 
     @property
-    def edits(self):
+    def edits(self) -> List[Edit]:
         """
         Returns the edits. Most events will have a single edit, a single event
         will have multiple edits when a dissolve, wipe or key transition needs
@@ -30,17 +32,19 @@ class Event:
         clip_names  = self._clip_name_statements()
         source_files= self._source_file_statements()
          
-        the_zip = [edits_audio]
+        the_zip: List[List[Any]] = [edits_audio]
 
         if len(edits_audio) == 2:
-            cn = [None, None]
+            start_name: Optional[StmtClipName] = None
+            end_name: Optional[StmtClipName] = None
+
             for clip_name in clip_names:
                 if clip_name.affect == 'from':
-                    cn[0] = clip_name
+                    start_name = clip_name
                 elif clip_name.affect == 'to':
-                    cn[1] = clip_name
+                    end_name = clip_name
 
-            the_zip.append(cn)
+            the_zip.append([start_name, end_name])
         else:    
             if len(edits_audio) == len(clip_names):
                 the_zip.append(clip_names)
@@ -57,17 +61,20 @@ class Event:
         # attach trans name to last event
         try:
             trans_statement = self._trans_name_statements()[0]
-            trans_names = [None] * (len(edits_audio) - 1)
+            trans_names: List[Optional[Any]] = [None] * (len(edits_audio) - 1)
             trans_names.append(trans_statement)
             the_zip.append(trans_names)
         except IndexError:
             the_zip.append([None] * len(edits_audio) )
 
-
-        return [ Edit(e1[0],e1[1],n1,s1,u1) for (e1,n1,s1,u1) in zip(*the_zip) ]
+        return [ Edit(edit_statement=e1[0],
+                      audio_ext_statement=e1[1],
+                      clip_name_statement=n1,
+                      source_file_statement=s1,
+                      trans_name_statement=u1) for (e1,n1,s1,u1) in zip(*the_zip) ]
             
     @property
-    def unrecognized_statements(self):
+    def unrecognized_statements(self) -> Generator[StmtUnrecognized, None, None]:
         """
         A generator for all the unrecognized statements in the event.
         """
@@ -75,19 +82,19 @@ class Event:
             if type(s) is StmtUnrecognized:
                 yield s
     
-    def _trans_name_statements(self):
+    def _trans_name_statements(self) -> List[StmtEffectsName]:
         return [s for s in self.statements if type(s) is StmtEffectsName]
 
-    def _edit_statements(self):
+    def _edit_statements(self) -> List[StmtEvent]:
         return [s for s in self.statements if type(s) is StmtEvent]
 
-    def _clip_name_statements(self):
+    def _clip_name_statements(self) -> List[StmtClipName]:
         return [s for s in self.statements if type(s) is StmtClipName]
     
-    def _source_file_statements(self):
+    def _source_file_statements(self) -> List[StmtSourceFile]:
         return [s for s in self.statements if type(s) is StmtSourceFile]
     
-    def _statements_with_audio_ext(self):
+    def _statements_with_audio_ext(self) -> Generator[Tuple[StmtEvent, Optional[StmtAudioExt]], None, None]:
         for (s1, s2) in zip(self.statements, self.statements[1:]):
             if type(s1) is StmtEvent and type(s2) is StmtAudioExt:
                 yield (s1,s2)
diff --git a/pycmx/parse_cmx_events.py b/pycmx/parse_cmx_events.py
index 211e2ad..176c0cc 100644
--- a/pycmx/parse_cmx_events.py
+++ b/pycmx/parse_cmx_events.py
@@ -1,20 +1,19 @@
 # pycmx
 # (c) 2018 Jamie Hardt
 
-from collections import namedtuple
+# from collections import namedtuple
 
-from .parse_cmx_statements import (parse_cmx3600_statements, StmtEvent,StmtFCM )
+from .parse_cmx_statements import (parse_cmx3600_statements)
 from .edit_list import EditList
 
-def parse_cmx3600(f):
+from typing import TextIO 
+
+def parse_cmx3600(f: TextIO):
     """
     Parse a CMX 3600 EDL.
 
-    Args:
-        f : a file-like object, anything that's readlines-able.
-
-    Returns:
-        An :class:`pycmx.edit_list.EditList`.
+    :param TextIO f: a file-like object, anything that's readlines-able.
+    :returns: An :class:`pycmx.edit_list.EditList`.
     """
     statements = parse_cmx3600_statements(f)
     return EditList(statements)
diff --git a/pycmx/parse_cmx_statements.py b/pycmx/parse_cmx_statements.py
index d391698..957c238 100644
--- a/pycmx/parse_cmx_statements.py
+++ b/pycmx/parse_cmx_statements.py
@@ -5,6 +5,8 @@ import re
 import sys
 from collections import namedtuple
 from itertools import count
+from typing import TextIO, List
+
 
 from .util import collimate
 
@@ -18,12 +20,12 @@ StmtSourceFile = namedtuple("SourceFile",["filename","line_number"])
 StmtRemark =    namedtuple("Remark",["text","line_number"])
 StmtEffectsName = namedtuple("EffectsName",["name","line_number"])
 StmtSourceUMID =   namedtuple("Source",["name","umid","line_number"])
-StmtSplitEdit = namedtuple("SplitEdit",["video","magnitue", "line_number"])
+StmtSplitEdit = namedtuple("SplitEdit",["video","magnitude", "line_number"])
 StmtMotionMemory = namedtuple("MotionMemory",["source","fps"]) # FIXME needs more fields
 StmtUnrecognized = namedtuple("Unrecognized",["content","line_number"])
 
 
-def parse_cmx3600_statements(file):
+def parse_cmx3600_statements(file: TextIO) -> List[object]:
     """
     Return a list of every statement in the file argument.
     """
@@ -109,7 +111,7 @@ def _parse_extended_audio_channels(line, line_number):
     else:
         return StmtUnrecognized(content=line, line_number=line_number)
     
-def _parse_remark(line, line_number):
+def _parse_remark(line, line_number) -> object:
     if line.startswith("FROM CLIP NAME:"):
         return StmtClipName(name=line[15:].strip() , affect="from", line_number=line_number)
     elif line.startswith("TO CLIP NAME:"):
@@ -119,7 +121,7 @@ def _parse_remark(line, line_number):
     else:
         return StmtRemark(text=line, line_number=line_number)
 
-def _parse_effects_name(line, line_number):
+def _parse_effects_name(line, line_number) -> StmtEffectsName:
     name = line[16:].strip()
     return StmtEffectsName(name=name, line_number=line_number)
 
diff --git a/pycmx/transition.py b/pycmx/transition.py
index 988b411..5d2ebe3 100644
--- a/pycmx/transition.py
+++ b/pycmx/transition.py
@@ -1,5 +1,7 @@
 # pycmx
-# (c) 2018 Jamie Hardt
+# (c) 2023 Jamie Hardt
+
+from typing import Optional
 
 class Transition:
     """
@@ -19,7 +21,7 @@ class Transition:
         self.name = name
 
     @property
-    def kind(self):
+    def kind(self) -> Optional[str]:
         """
         Return the kind of transition: Cut, Wipe, etc
         """
@@ -37,22 +39,22 @@ class Transition:
             return Transition.KeyOut
 
     @property
-    def cut(self):
+    def cut(self) -> bool:
         "`True` if this transition is a cut."
         return self.transition == 'C' 
 
     @property
-    def dissolve(self):
+    def dissolve(self) -> bool:
         "`True` if this traansition is a dissolve."
         return self.transition == 'D'
 
     @property
-    def wipe(self):
+    def wipe(self) -> bool:
         "`True` if this transition is a wipe."
         return self.transition.startswith('W')
 
     @property
-    def effect_duration(self):
+    def effect_duration(self) -> int:
         """The duration of this transition, in frames of the record target.
         
         In the event of a key event, this is the duration of the fade in.
@@ -60,7 +62,7 @@ class Transition:
         return int(self.operand)
 
     @property
-    def wipe_number(self):
+    def wipe_number(self) -> Optional[int]:
         "Wipes are identified by a particular number."
         if self.wipe:
             return int(self.transition[1:])
@@ -68,19 +70,21 @@ class Transition:
             return None
 
     @property
-    def key_background(self):
+    def key_background(self) -> bool:
         "`True` if this edit is a key background."
         return self.transition == Transition.KeyBackground
 
     @property
-    def key_foreground(self):
+    def key_foreground(self) -> bool:
         "`True` if this edit is a key foreground."
         return self.transition == Transition.Key
 
     @property
-    def key_out(self):
+    def key_out(self) -> bool:
         """
         `True` if this edit is a key out. This material will removed from
         the key foreground and replaced with the key background.
         """
         return self.transition == Transition.KeyOut
+
+