diff --git a/template/engine/ly2cbox.py b/template/engine/ly2cbox.py
index 7e3ecbe..90b72da 100644
--- a/template/engine/ly2cbox.py
+++ b/template/engine/ly2cbox.py
@@ -26,6 +26,7 @@ This is mostly meant for development and testing.
 
 #Standard Library Modules
 import re
+from typing import Dict
 
 #Third Party Modules
 from calfbox import cbox
@@ -35,10 +36,10 @@ from . import pitch
 from .duration import DB, DL, D1, D2, D4, D8, D16, D32, D64, D128
 
 
-lyToMidi = {} #filled for all pitches on startup, below
-for ly, _pitch in pitch.ly2pitch.items():
+lyToMidi:Dict[str,int] = {} #filled for all pitches on startup, below
+for lyPitchString, _pitch in pitch.ly2pitch.items():
     octOffset = (pitch.octave(_pitch) +1) * 12 #twelve tones per midi octave
-    lyToMidi[ly] = octOffset +  pitch.halfToneDistanceFromC(_pitch)
+    lyToMidi[lyPitchString] = octOffset +  pitch.halfToneDistanceFromC(_pitch)
 
 
 lyToTicks = {
@@ -68,7 +69,7 @@ def pattern(lilypondString:str, channel, velocity:int=100):
     """
     Return a cbox pattern
     a python byte data type with midi data for cbox.
-    
+
     Channel is 1-16."""
     #cbox.Pattern.serialize_event(position, midibyte1 (noteon), midibyte2(pitch), midibyte3(velocity))
     channel -= 1
@@ -79,7 +80,7 @@ def pattern(lilypondString:str, channel, velocity:int=100):
         patternBlob += cbox.Pattern.serialize_event(tickCounter, 0x90+channel, midiPitch, velocity) # note on
         patternBlob += cbox.Pattern.serialize_event(endTick, 0x80+channel, midiPitch, velocity) # note off
         tickCounter = tickCounter + durationInTicks #no -1 for the next note
-    
+
     pattern = cbox.Document.get_song().pattern_from_blob(patternBlob, tickCounter)
     #return patternBlob, startTick
     return pattern
diff --git a/template/engine/sampler_sf2.py b/template/engine/sampler_sf2.py
index 120c5bf..fe43aa6 100644
--- a/template/engine/sampler_sf2.py
+++ b/template/engine/sampler_sf2.py
@@ -25,6 +25,8 @@ import logging; logger = logging.getLogger(__name__); logger.info("import")
 
 #Python Standard Lib
 import os.path
+from os import PathLike
+from typing import List, Dict, Union
 
 #Third Party
 from calfbox import cbox
@@ -48,9 +50,9 @@ class Sampler_sf2(Data):
     def __init__(self, parentSession, filePath, activePatches, ignoreProgramChanges, mixer:bool, defaultSoundfont=None):
         super().__init__(parentSession)
 
-        self._unlinkOnSave = []
+        self._unlinkOnSave:List[Union[str, PathLike]] = [] #old sf2 files no longer in use.
         self.filePath = filePath
-        self.patchlist = {} #bank:{program:name}
+        self.patchlist:Dict[int,Dict[int, str]] = {} #bank:{program:name}
         self.buffer_ignoreProgramChanges = ignoreProgramChanges
 
         self.midiInput = MidiInput(session=parentSession, portName="all")
@@ -166,7 +168,7 @@ class Sampler_sf2(Data):
     def _convertPatches(self, dictionary:dict):
         """Returns a dict of dicts:
             bank:{program:name}"""
-        result = {}
+        result:Dict[int,Dict[int, str]] = {} #same as self.patchlist
         for value, name in dictionary.items():
             program = value & 127
             bank =  value >> 7
diff --git a/template/qtgui/midiinquickwidget.py b/template/qtgui/midiinquickwidget.py
index f483e6e..f9d3eab 100644
--- a/template/qtgui/midiinquickwidget.py
+++ b/template/qtgui/midiinquickwidget.py
@@ -74,19 +74,19 @@ class QuickMidiInputComboController(QtWidgets.QWidget):
         #api.callbacks.auditionerVolumeChanged.append(self.callback__auditionerVolumeChanged)
 
     def callback_startLoadingAuditionerInstrument(self, idkey):
-        self.parentWidget.qtApp.setOverrideCursor(QtCore.Qt.WaitCursor) #reset in self.callback_auditionerInstrumentChanged
+        self.parentWidget.qtApp.setOverrideCursor(QtCore.Qt.WaitCursor) # type: ignore #mypy doesn't know PyQts parent Widget  #reset in self.callback_auditionerInstrumentChanged
         self.label.setText(QtCore.QCoreApplication.translate("QuickMidiInputComboController", "…loading…"))
         self.parentWidget.qtApp.processEvents() #actually show the label and cursor
 
     def callback_auditionerInstrumentChanged(self, exportMetadata:dict):
-        self.parentWidget.qtApp.restoreOverrideCursor() #We assume the cursor was set to a loading animation
+        app = self.parentWidget.qtApp.restoreOverrideCursor() # type: ignore #mypy doesn't know PyQts parent Widget #We assume the cursor was set to a loading animation
         key = exportMetadata["id-key"]
         t = f"➜ [{key[0]}-{key[1]}] {exportMetadata['name']}"
         self.label.setText(t)
 
     def callback__auditionerVolumeChanged(self, value:float):
         self.volumeDial.setValue(value)
-        self.parentWidget.statusBar().showMessage(QtCore.QCoreApplication.translate("QuickMidiInputComboController", "Volume: {}").format(value))
+        self.parentWidget.statusBar().showMessage(QtCore.QCoreApplication.translate("QuickMidiInputComboController", "Volume: {}").format(value))  # type: ignore #mypy doesn't know PyQts parent Widget
 
     def _sendVolumeChangeToEngine(self, newValue):
         self.volumeDial.blockSignals(True)