diff --git a/.idea/codeStyles/Project.xml b/.idea/codeStyles/Project.xml
index 6ba1724..e9e0292 100644
--- a/.idea/codeStyles/Project.xml
+++ b/.idea/codeStyles/Project.xml
@@ -2,5 +2,17 @@
   <code_scheme name="Project" version="173">
     <option name="LINE_SEPARATOR" value="&#10;" />
     <option name="RIGHT_MARGIN" value="88" />
+    <Python>
+      <option name="NEW_LINE_AFTER_COLON" value="true" />
+      <option name="FROM_IMPORT_NEW_LINE_AFTER_LEFT_PARENTHESIS" value="true" />
+      <option name="FROM_IMPORT_NEW_LINE_BEFORE_RIGHT_PARENTHESIS" value="true" />
+      <option name="FROM_IMPORT_PARENTHESES_FORCE_IF_MULTILINE" value="true" />
+      <option name="FROM_IMPORT_TRAILING_COMMA_IF_MULTILINE" value="true" />
+    </Python>
+    <codeStyleSettings language="Python">
+      <indentOptions>
+        <option name="CONTINUATION_INDENT_SIZE" value="4" />
+      </indentOptions>
+    </codeStyleSettings>
   </code_scheme>
 </component>
\ No newline at end of file
diff --git a/.idea/codeStyles/codeStyleConfig.xml b/.idea/codeStyles/codeStyleConfig.xml
index 6e6eec1..79ee123 100644
--- a/.idea/codeStyles/codeStyleConfig.xml
+++ b/.idea/codeStyles/codeStyleConfig.xml
@@ -1,6 +1,5 @@
 <component name="ProjectCodeStyleConfiguration">
   <state>
     <option name="USE_PER_PROJECT_SETTINGS" value="true" />
-    <option name="PREFERRED_PROJECT_CODE_STYLE" value="Default" />
   </state>
 </component>
\ No newline at end of file
diff --git a/corrscope/corrscope.py b/corrscope/corrscope.py
index 68962a3..809c70a 100644
--- a/corrscope/corrscope.py
+++ b/corrscope/corrscope.py
@@ -1,6 +1,5 @@
 # -*- coding: utf-8 -*-
 import time
-import warnings
 from contextlib import ExitStack, contextmanager
 from enum import unique, IntEnum
 from fractions import Fraction
@@ -12,16 +11,9 @@ import attr
 
 from corrscope import outputs as outputs_
 from corrscope.channel import Channel, ChannelConfig
-from corrscope.config import (
-    KeywordAttrs,
-    register_enum,
-    Ignored,
-    CorrError,
-    CorrWarning,
-)
-
-from corrscope.renderer import MatplotlibRenderer, RendererConfig
+from corrscope.config import KeywordAttrs, register_enum, CorrError
 from corrscope.layout import LayoutConfig
+from corrscope.renderer import MatplotlibRenderer, RendererConfig
 from corrscope.triggers import ITriggerConfig, CorrelationTriggerConfig, PerFrameCache
 from corrscope.util import pushd, coalesce
 from corrscope.wave import Wave
diff --git a/corrscope/gui/data_bind.py b/corrscope/gui/data_bind.py
index 233649c..e1d96c1 100644
--- a/corrscope/gui/data_bind.py
+++ b/corrscope/gui/data_bind.py
@@ -7,7 +7,7 @@ from PyQt5.QtCore import pyqtSlot
 from PyQt5.QtGui import QPalette, QColor
 from PyQt5.QtWidgets import QWidget
 
-from corrscope.config import CorrError
+from corrscope.config import CorrError, DumpableAttrs
 from corrscope.triggers import lerp
 from corrscope.util import obj_name, perr
 
@@ -18,7 +18,6 @@ __all__ = ["PresentationModel", "map_gui", "behead", "rgetattr", "rsetattr"]
 
 
 WidgetUpdater = Callable[[], None]
-Attrs = Any
 
 
 class PresentationModel(qc.QObject):
@@ -35,7 +34,7 @@ class PresentationModel(qc.QObject):
     combo_text: Dict[str, List[str]]
     edited = qc.pyqtSignal()
 
-    def __init__(self, cfg: Attrs):
+    def __init__(self, cfg: DumpableAttrs):
         super().__init__()
         self.cfg = cfg
         self.update_widget: Dict[str, WidgetUpdater] = {}
@@ -58,7 +57,7 @@ class PresentationModel(qc.QObject):
         else:
             raise AttributeError(f"cannot set attribute {key} on {obj_name(self)}()")
 
-    def set_cfg(self, cfg: Attrs):
+    def set_cfg(self, cfg: DumpableAttrs):
         self.cfg = cfg
         for updater in self.update_widget.values():
             updater()
diff --git a/corrscope/settings/__init__.py b/corrscope/settings/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29