diff --git a/flax/cues/cuelist1 b/flax/cues/cuelist1
--- a/flax/cues/cuelist1
+++ b/flax/cues/cuelist1
@@ -1,148 +1,160 @@
 <?xml version="1.0"?>
 <!DOCTYPE PyObject SYSTEM "PyObjects.dtd">
 <PyObject family="obj" type="builtin_wrapper"  class="_EmptyClass">
-<attr name="__toplevel__" family="map" type="__compound__" extra="None TreeDict" id="138331628" >
+<attr name="__toplevel__" family="map" type="__compound__" extra="None TreeDict" id="138432956" >
   <entry>
     <key type="string" value="cues" />
-    <val type="list" id="139721548" >
-      <item type="PyObject" id="140191300" class="Cue">
+    <val type="list" id="139794108" >
+      <item type="PyObject" id="140312100" class="Cue">
         <attr name="desc" type="string" value="whoa - this works" />
-        <attr name="some_attribute" type="numeric" value="3" />
+        <attr name="page" type="string" value="3.2" />
         <attr name="name" type="string" value="tevya special" />
-        <attr name="page" type="string" value="3.2" />
+        <attr name="sub_levels" type="string" value="green : 1.0" />
         <attr name="time" type="string" value="0" />
       </item>
-      <item type="PyObject" id="140191340" class="Cue">
-        <attr name="desc" type="string" value="music flourish" />
-        <attr name="some_attribute" type="numeric" value="3" />
+      <item type="PyObject" id="139843388" class="Cue">
+        <attr name="subdict" type="dict" id="140307292" >
+        </attr>
         <attr name="name" type="string" value="lady luck" />
-        <attr name="page" type="string" value="1.1.5" />
         <attr name="time" type="string" value="1" />
+        <attr name="page" type="string" value="1.1.5" />
+        <attr name="sub_levels" type="string" value="blue : 1.0, green : 0.5" />
+        <attr name="desc" type="string" value="music flourish" />
       </item>
-      <item type="PyObject" id="139672340" class="Cue">
-        <attr name="desc" type="string" value="tevya: &quot;what&apos;s happening to the tradition?&quot;" />
-        <attr name="some_attribute" type="numeric" value="3" />
+      <item type="PyObject" id="139773172" class="Cue">
+        <attr name="subdict" type="dict" id="139774164" >
+        </attr>
         <attr name="name" type="string" value="dolly solo" />
-        <attr name="page" type="string" value="1.2.10" />
         <attr name="time" type="string" value="2" />
+        <attr name="page" type="string" value="1.2.10" />
+        <attr name="sub_levels" type="string" value="blue : 0.1, green : 0.1" />
+        <attr name="desc" type="string" value="tevya: &quot;what&apos;s happening to the tradition?&quot;" />
       </item>
-      <item type="PyObject" id="140195900" class="Cue">
-        <attr name="desc" type="string" value="the third cue" />
-        <attr name="some_attribute" type="numeric" value="3" />
+      <item type="PyObject" id="139793260" class="Cue">
+        <attr name="subdict" type="dict" id="139774508" >
+        </attr>
         <attr name="name" type="string" value="cue 3" />
+        <attr name="time" type="string" value="4" />
         <attr name="page" type="string" value="1.2.14" />
-        <attr name="time" type="string" value="41" />
+        <attr name="sub_levels" type="string" value="red : 1" />
+        <attr name="desc" type="string" value="the third cue" />
       </item>
-      <item type="PyObject" id="139671436" class="Cue">
+      <item type="PyObject" id="139775180" class="Cue">
+        <attr name="subdict" type="dict" id="139774764" >
+        </attr>
+        <attr name="name" type="string" value="heart" />
         <attr name="time" type="string" value="42" />
-        <attr name="some_attribute" type="numeric" value="3" />
-        <attr name="name" type="string" value="heart" />
         <attr name="page" type="string" value="1.3.13" />
+        <attr name="sub_levels" type="string" value="frontwhite : 0.2, red : 0.7" />
         <attr name="desc" type="string" value="&quot;you&apos;ve gotta have heart&quot;" />
       </item>
-      <item type="PyObject" id="139673348" class="Cue">
+      <item type="PyObject" id="140308580" class="Cue">
+        <attr name="subdict" type="dict" id="140311956" >
+        </attr>
+        <attr name="name" type="string" value="more musical refs" />
         <attr name="time" type="string" value="5" />
-        <attr name="some_attribute" type="numeric" value="3" />
-        <attr name="name" type="string" value="more musical refs" />
         <attr name="page" type="string" value="1.3.17" />
+        <attr name="sub_levels" type="string" value="blue : 1.0" />
         <attr name="desc" type="string" value="etc." />
       </item>
-      <item type="PyObject" id="139671036" class="Cue">
+      <item type="PyObject" id="139772700" class="Cue">
+        <attr name="subdict" type="dict" id="140311684" >
+        </attr>
+        <attr name="name" type="string" value="rainbow shimmer" />
         <attr name="time" type="string" value="6" />
-        <attr name="some_attribute" type="numeric" value="3" />
-        <attr name="name" type="string" value="rainbow shimmer" />
         <attr name="page" type="string" value="1.4.2" />
+        <attr name="sub_levels" type="string" value="" />
         <attr name="desc" type="string" value="curtain close" />
       </item>
-      <item type="PyObject" id="138625292" class="Cue">
+      <item type="PyObject" id="139774908" class="Cue">
+        <attr name="subdict" type="dict" id="140310884" >
+        </attr>
+        <attr name="name" type="string" value="fade up" />
         <attr name="time" type="string" value="7" />
-        <attr name="some_attribute" type="numeric" value="3" />
-        <attr name="name" type="string" value="fade up" />
         <attr name="page" type="string" value="2.1.1" />
+        <attr name="sub_levels" type="string" value="" />
         <attr name="desc" type="string" value="stage manager: &quot;worklights, please&quot;" />
       </item>
-      <item type="PyObject" id="140192780" class="Cue">
+      <item type="PyObject" id="140311076" class="Cue">
+        <attr name="subdict" type="dict" id="140310300" >
+        </attr>
+        <attr name="name" type="string" value="blackout" />
         <attr name="time" type="string" value="8" />
-        <attr name="some_attribute" type="numeric" value="3" />
-        <attr name="name" type="string" value="blackout" />
         <attr name="page" type="string" value="2.1.2" />
+        <attr name="sub_levels" type="string" value="" />
         <attr name="desc" type="string" value="&quot;lights out!&quot;" />
       </item>
-      <item type="PyObject" id="139661388" class="Cue">
+      <item type="PyObject" id="140304700" class="Cue">
+        <attr name="subdict" type="dict" id="140302268" >
+        </attr>
+        <attr name="name" type="string" value="sill" />
         <attr name="time" type="string" value="4.2" />
-        <attr name="some_attribute" type="numeric" value="3" />
-        <attr name="name" type="string" value="sill" />
         <attr name="page" type="string" value="2.2.4" />
+        <attr name="sub_levels" type="string" value="" />
         <attr name="desc" type="string" value="another description" />
       </item>
-      <item type="PyObject" id="139661252" class="Cue">
+      <item type="PyObject" id="140309860" class="Cue">
         <attr name="desc" type="string" value="mr. cue 10" />
-        <attr name="some_attribute" type="numeric" value="3" />
+        <attr name="page" type="string" value="2.7.3" />
         <attr name="name" type="string" value="front only" />
-        <attr name="page" type="string" value="2.7.3" />
+        <attr name="sub_levels" type="string" value="" />
         <attr name="time" type="string" value="10" />
       </item>
-      <item type="PyObject" id="140192452" class="Cue">
+      <item type="PyObject" id="140310788" class="Cue">
         <attr name="desc" type="string" value="" />
-        <attr name="some_attribute" type="numeric" value="3" />
+        <attr name="page" type="string" value="" />
         <attr name="name" type="string" value="cue 11" />
-        <attr name="page" type="string" value="" />
+        <attr name="sub_levels" type="string" value="" />
         <attr name="time" type="string" value="11" />
       </item>
-      <item type="PyObject" id="139670252" class="Cue">
+      <item type="PyObject" id="139762676" class="Cue">
+        <attr name="sub_levels" type="string" value="" />
         <attr name="desc" type="string" value="" />
-        <attr name="some_attribute" type="numeric" value="3" />
-        <attr name="name" type="string" value="cue 12" />
         <attr name="page" type="string" value="" />
-        <attr name="time" type="string" value="12" />
+        <attr name="name" type="string" value="cue 12" />
+        <attr name="time" type="string" value="2.1" />
       </item>
-      <item type="PyObject" id="139670324" class="Cue">
+      <item type="PyObject" id="140301540" class="Cue">
+        <attr name="sub_levels" type="string" value="" />
         <attr name="desc" type="string" value="" />
-        <attr name="some_attribute" type="numeric" value="3" />
+        <attr name="page" type="string" value="" />
         <attr name="name" type="string" value="cue 13" />
-        <attr name="page" type="string" value="" />
         <attr name="time" type="string" value="13" />
       </item>
-      <item type="PyObject" id="139670436" class="Cue">
+      <item type="PyObject" id="140310636" class="Cue">
         <attr name="desc" type="string" value="" />
-        <attr name="some_attribute" type="numeric" value="3" />
+        <attr name="page" type="string" value="" />
         <attr name="name" type="string" value="cue 14" />
-        <attr name="page" type="string" value="" />
         <attr name="time" type="string" value="14" />
       </item>
-      <item type="PyObject" id="139670548" class="Cue">
+      <item type="PyObject" id="140307748" class="Cue">
         <attr name="desc" type="string" value="" />
-        <attr name="some_attribute" type="numeric" value="3" />
+        <attr name="page" type="string" value="" />
         <attr name="name" type="string" value="cue 15" />
-        <attr name="page" type="string" value="" />
         <attr name="time" type="string" value="15" />
       </item>
-      <item type="PyObject" id="139664044" class="Cue">
+      <item type="PyObject" id="140309436" class="Cue">
         <attr name="desc" type="string" value="" />
-        <attr name="some_attribute" type="numeric" value="3" />
+        <attr name="page" type="string" value="" />
         <attr name="name" type="string" value="cue 16" />
-        <attr name="page" type="string" value="" />
         <attr name="time" type="string" value="16" />
       </item>
-      <item type="PyObject" id="140194148" class="Cue">
+      <item type="PyObject" id="140290764" class="Cue">
         <attr name="desc" type="string" value="" />
-        <attr name="some_attribute" type="numeric" value="3" />
+        <attr name="page" type="string" value="" />
         <attr name="name" type="string" value="cue 17" />
-        <attr name="page" type="string" value="" />
         <attr name="time" type="string" value="17" />
       </item>
-      <item type="PyObject" id="140185996" class="Cue">
+      <item type="PyObject" id="140300196" class="Cue">
         <attr name="desc" type="string" value="" />
-        <attr name="some_attribute" type="numeric" value="3" />
+        <attr name="page" type="string" value="" />
         <attr name="name" type="string" value="some name" />
-        <attr name="page" type="string" value="" />
         <attr name="time" type="string" value="18" />
       </item>
-      <item type="PyObject" id="139662308" class="Cue">
+      <item type="PyObject" id="140301756" class="Cue">
         <attr name="desc" type="string" value="" />
-        <attr name="some_attribute" type="numeric" value="3" />
+        <attr name="page" type="string" value="" />
         <attr name="name" type="string" value="cue 19" />
-        <attr name="page" type="string" value="" />
         <attr name="time" type="string" value="19" />
       </item>
     </val>