diff --git a/python_payload/bl00mbox/_user.py b/python_payload/bl00mbox/_user.py
index 06b76a8f7b843722d54bf06237bfc35a107ebede..251e5748d6783813951e2c729f5048d182b97c99 100644
--- a/python_payload/bl00mbox/_user.py
+++ b/python_payload/bl00mbox/_user.py
@@ -308,6 +308,7 @@ class SignalInput(Signal):
     def _stop(self):
         self.value = 0
 
+
 class SignalInputTriggerMixin:
     def start(self, velocity=32767):
         self._start(velocity)
@@ -355,21 +356,27 @@ class SignalGainMixin:
 class SignalOutputTrigger(SignalOutput):
     pass
 
+
 class SignalOutputPitch(SignalOutput, SignalPitchMixin):
     pass
 
+
 class SignalOutputGain(SignalOutput, SignalGainMixin):
     pass
 
+
 class SignalInputTrigger(SignalInput, SignalInputTriggerMixin):
     pass
 
+
 class SignalInputPitch(SignalInput, SignalPitchMixin):
     pass
 
+
 class SignalInputGain(SignalInput, SignalGainMixin):
     pass
 
+
 class SignalMpxList:
     def __init__(self):
         self._list = []
@@ -396,7 +403,7 @@ class SignalMpxList:
         return self
 
     def __next__(self):
-        self._iter_index += 1;
+        self._iter_index += 1
         if self._iter_index >= len(self._list):
             raise StopIteration
         else:
@@ -422,6 +429,7 @@ class SignalMpxList:
         else:
             raise AttributeError("signal does not exist")
 
+
 class SignalList:
     def __init__(self, plugin):
         self._list = []
@@ -472,7 +480,6 @@ class SignalList:
                     setattr(self, name, SignalMpxList())
                 getattr(self, name, None).add_new_signal(signal, signal._mpx)
         self._setattr_allowed = False
-                
 
     def __setattr__(self, key, value):
         current_value = getattr(self, key, None)