Accessing scenes in dynamically loaded MovieClip?

Dear experts,
I have used ming 0.4.2 to produce a simple SWF with one
stroke per frame and grouped handfulls of frames into scenes - all
of them labeled for easy tracing. If I look at the resulting raw
file I can see the scene labels near the end as what seems to be a
simple list of offset/label pairs. If I compile the latest swftools
(almost 0.9.0 - needs minor Makefile adjustments) I can use swfdump
to see that there is in fact a SCENEDESCRIPTION tag there (earlier
versions do not recognize tag 056).
However, when I load this into my flex program the movieclip
claims that there is only a single unlabeled scene containing all
the frames - presumably indicating that is has ignored the scene
description.
How can I persuade it to do the right thing?
Note that in order to be able to control the playback of the
movieclip (gotoAndStop etc) I have had to use
This
Trick.
For various other reasons, my app requires flash 9 r124 or
later. I have tried flash 10 with the same results.
All advice appreciated.

Update: I just saw there was a new release of swftools and
the new swfdump knows about the 0x056 tag which dumps nicely as you
can see at the end of this message.
So, the file certainly verifies OK. Maybe I've missed
something very obvious? (Beyond the somewhat vague: "you shouldn't
use scenes" that seems to be a hint here and there.)

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    var xmlLoader:URLLoader = new URLLoader();xmlLoader.addEventListener(Event.COMPLETE, showXML);xmlLoader.load(new URLRequest("for_elise_by_beethoven.xml"));function showXML(e:Event):void { XML.ignoreWhitespace=true; var songs:XML=new XML(e.target.data); trace(songs.Track.Event.length()); var i:Number; var keytimer:Array = new Array(); for (i=0; i < songs.Track.Event.length(); i++) { keytimer[i] =(" Time of the key: "+ songs.Track.Event[i].Absolute.text()); if (current==keytimer[i]) { trace("yes"); } //trace(keytimer[i]); //trace(" NoteOn: "+ songs.Track.Event[i][email protected]); //trace(" NoteOff: "+ songs.Track.Event[i][email protected]); //trace(" "); } var myTimer:Timer=new Timer(1,190000); myTimer.addEventListener(TimerEvent.TIMER,doStuff); var current:Number=0; myTimer.start(); function doStuff(event:TimerEvent):void { current++; trace("current: "+ current); trace("keytimer: "+ keytimer[i]); //trace("keytimer: "+ keytimer[i]); /*if (current==keytimer[i]) { trace("yes"); }*/  }}
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    <?xml version="1.0" encoding="ISO-8859-1"?><!DOCTYPE MIDIFile PUBLIC  "-//Recordare//DTD MusicXML 0.9 MIDI//EN"  "http://www.musicxml.org/dtds/midixml.dtd"><MIDIFile><Format>1</Format><TrackCount>4</TrackCount><TicksPerBeat>960</TicksPerBeat><TimestampType>Absolute</TimestampType><Track Number="0">  <Event>    <Absolute>0</Absolute>    <SequencerSpecific>05 0f 12 00 00 7f 7f 00</SequencerSpecific>  </Event>  <Event>    <Absolute>0</Absolute>    <SequencerSpecific>05 0f 1c 32 30 30 35 2e 31 32 2e 30 32</SequencerSpecific>  </Event>  <Event>    <Absolute>0</Absolute>    <TrackName>Track 0</TrackName>  </Event>  <Event>    <Absolute>0</Absolute>    <SetTempo Value="857143"/>  </Event>  <Event>    <Absolute>0</Absolute>    <EndOfTrack/>  </Event></Track><Track Number="1">  <Event>    <Absolute>0</Absolute>    <ProgramChange Channel="1" Number="0"/>  </Event>  <Event>    <Absolute>0</Absolute>    <SequencerSpecific>05 0f 09 40 48</SequencerSpecific>  </Event>  <Event>    <Absolute>0</Absolute>    <CopyrightNotice>2006 by forelise.com</CopyrightNotice>  </Event>  <Event>    <Absolute>0</Absolute>    <InstrumentName>Piano</InstrumentName>  </Event>  <Event>    <Absolute>0</Absolute>    <TrackName>Für Elise</TrackName>  </Event>  <Event>    <Absolute>0</Absolute>    <SequencerSpecific>05 0f 06 47 65 6e 65 72 61 6c 20 4d 49 44 49</SequencerSpecific>  </Event>  <Event>    <Absolute>0</Absolute>    <TimeSignature Numerator="3" LogDenominator="3" MIDIClocksPerMetronomeClick="12" ThirtySecondsPer24Clocks="8"/>  </Event>  <Event>    <Absolute>0</Absolute>    <MIDIChannelPrefix Value="00"/>  </Event>  <Event>    <Absolute>960</Absolute>    <NoteOn Channel="1" Note="76" Velocity="71"/>  </Event>  <Event>    <Absolute>1200</Absolute>    <NoteOff Channel="1" Note="76" Velocity="0"/>  </Event>  <Event>    <Absolute>1200</Absolute>    <NoteOn Channel="1" Note="75" Velocity="38"/>  </Event>  <Event>    <Absolute>1440</Absolute>    <NoteOff Channel="1" Note="75" Velocity="0"/>  </Event>  <Event>    <Absolute>1440</Absolute>    <NoteOn Channel="1" Note="76" Velocity="57"/>  </Event>  <Event>    <Absolute>1680</Absolute>    <NoteOff Channel="1" Note="76" Velocity="0"/>  </Event>  <Event>    <Absolute>1680</Absolute>    <NoteOn Channel="1" Note="75" Velocity="70"/>  </Event>  <Event>    <Absolute>1920</Absolute>    <NoteOff Channel="1" Note="75" Velocity="0"/>  </Event>  <Event>    <Absolute>1920</Absolute>    <NoteOn Channel="1" Note="76" Velocity="76"/>  </Event>  <Event>    <Absolute>2160</Absolute>    <NoteOff Channel="1" Note="76" Velocity="0"/>  </Event>  <Event>    <Absolute>2160</Absolute>    <NoteOn Channel="1" Note="71" Velocity="76"/>  </Event>  <Event>    <Absolute>2400</Absolute>    <NoteOff Channel="1" Note="71" Velocity="0"/>  </Event>  <Event>    <Absolute>2400</Absolute>    <NoteOn Channel="1" Note="74" Velocity="76"/>  </Event>  <Event>    <Absolute>2640</Absolute>    <NoteOff Channel="1" Note="74" Velocity="0"/>  </Event>  <Event>    <Absolute>2640</Absolute>    <NoteOn Channel="1" Note="72" Velocity="83"/>  </Event>  <Event>    <Absolute>2880</Absolute>    <NoteOff Channel="1" Note="72" Velocity="0"/>  </Event>  <Event>    <Absolute>2880</Absolute>    <NoteOn Channel="1" Note="69" Velocity="89"/>  </Event>  <Event>    <Absolute>2880</Absolute>    <SequencerSpecific>05 0f 0f 02</SequencerSpecific>  </Event>  <Event>    <Absolute>2880</Absolute>    <NoteOn Channel="1" Note="45" Velocity="64"/>  </Event>  <Event>    <Absolute>3120</Absolute>    <NoteOff Channel="1" Note="45" Velocity="0"/>  </Event>  <Event>    <Absolute>3120</Absolute>    <NoteOn Channel="1" Note="52" Velocity="64"/>  </Event>  <Event>    <Absolute>3360</Absolute>    <NoteOff Channel="1" Note="52" Velocity="0"/>  </Event>  <Event>    <Absolute>3360</Absolute>    <NoteOn Channel="1" Note="57" Velocity="70"/>  </Event>  <Event>    <Absolute>3600</Absolute>    <NoteOff Channel="1" Note="69" Velocity="0"/>  </Event>  <Event>    <Absolute>3600</Absolute>    <NoteOff Channel="1" Note="57" Velocity="0"/>  </Event>  <Event>    <Absolute>3600</Absolute>    <NoteOn Channel="1" Note="60" Velocity="76"/>  </Event>  <Event>    <Absolute>3840</Absolute>    <NoteOff Channel="1" Note="60" Velocity="0"/>  </Event>  <Event>    <Absolute>3840</Absolute>    <NoteOn Channel="1" Note="64" Velocity="76"/>  </Event>  <Event>    <Absolute>4080</Absolute>    <NoteOff Channel="1" Note="64" Velocity="0"/>  </Event>  <Event>    <Absolute>4080</Absolute>    <NoteOn Channel="1" Note="69" Velocity="76"/>  </Event>  <Event>    <Absolute>4320</Absolute>    <NoteOff Channel="1" Note="69" Velocity="0"/>  </Event>  <Event>    <Absolute>4320</Absolute>    <NoteOn Channel="1" Note="71" Velocity="83"/>  </Event>  <Event>    <Absolute>4320</Absolute>    <SequencerSpecific>05 0f 0f 02</SequencerSpecific>  </Event>  <Event>    <Absolute>4320</Absolute>    <NoteOn Channel="1" Note="40" Velocity="64"/>  </Event>  <Event>    <Absolute>4560</Absolute>    <NoteOff Channel="1" Note="40" Velocity="0"/>  </Event>  <Event>    <Absolute>4560</Absolute>    <NoteOn Channel="1" Note="52" Velocity="64"/>  </Event>  <Event>    <Absolute>4800</Absolute>    <NoteOff Channel="1" Note="52" Velocity="0"/>  </Event>  <Event>    <Absolute>4800</Absolute>    <NoteOn Channel="1" Note="56" Velocity="70"/>  </Event>  <Event>    <Absolute>5040</Absolute>    <NoteOff Channel="1" Note="71" Velocity="0"/>  </Event>  <Event>    <Absolute>5040</Absolute>    <NoteOff Channel="1" Note="56" Velocity="0"/>  </Event>  <Event>    <Absolute>5040</Absolute>    <NoteOn Channel="1" Note="64" Velocity="76"/>  </Event>  <Event>    <Absolute>5280</Absolute>    <NoteOff Channel="1" Note="64" Velocity="0"/>  </Event>  <Event>    <Absolute>5280</Absolute>    <NoteOn Channel="1" Note="68" Velocity="76"/>  </Event>  <Event>    <Absolute>5520</Absolute>    <NoteOff Channel="1" Note="68" Velocity="0"/>  </Event>  <Event>    <Absolute>5520</Absolute>    <NoteOn Channel="1" Note="71" Velocity="76"/>  </Event>  <Event>    <Absolute>5760</Absolute>    <NoteOff Channel="1" Note="71" Velocity="0"/>  </Event>  <Event>    <Absolute>5760</Absolute>    <NoteOn Channel="1" Note="72" Velocity="83"/>  </Event>  <Event>    <Absolute>5760</Absolute>    <NoteOn Channel="1" Note="45" Velocity="64"/>  </Event>  <Event>    <Absolute>6000</Absolute>    <NoteOff Channel="1" Note="45" Velocity="0"/>  </Event>  <Event>    <Absolute>6000</Absolute>    <NoteOn Channel="1" Note="52" Velocity="70"/>  </Event>  <Event>    <Absolute>6240</Absolute>    <NoteOff Channel="1" Note="52" Velocity="0"/>  </Event>  <Event>    <Absolute>6240</Absolute>    <NoteOn Channel="1" Note="57" Velocity="76"/>  </Event>  <Event>    <Absolute>6480</Absolute>    <NoteOff Channel="1" Note="72" Velocity="0"/>  </Event>  <Event>    <Absolute>6480</Absolute>    <NoteOff Channel="1" Note="57" Velocity="0"/>  </Event>  <Event>    <Absolute>6480</Absolute>    <NoteOn Channel="1" Note="64" Velocity="76"/>  </Event>  <Event>    <Absolute>6720</Absolute>    <NoteOff Channel="1" Note="64" Velocity="0"/>  </Event>  <Event>    <Absolute>6720</Absolute>    <NoteOn Channel="1" Note="76" Velocity="76"/>  </Event>  <Event>    <Absolute>6960</Absolute>    <NoteOff Channel="1" Note="76" Velocity="0"/>  </Event>  <Event>    <Absolute>6960</Absolute>    <NoteOn Channel="1" Note="75" Velocity="64"/>  </Event>  <Event>    <Absolute>7200</Absolute>    <NoteOff Channel="1" Note="75" Velocity="0"/>  </Event>  <Event>    <Absolute>7200</Absolute>    <NoteOn Channel="1" Note="76" Velocity="76"/>  </Event>  <Event>    <Absolute>7440</Absolute>    <NoteOff Channel="1" Note="76" Velocity="0"/>  </Event>  <Event>    <Absolute>7440</Absolute>    <NoteOn Channel="1" Note="75" Velocity="70"/>  </Event>  <Event>    <Absolute>7680</Absolute>    <NoteOff Channel="1" Note="75" Velocity="0"/>  </Event>  <Event>    <Absolute>7680</Absolute>    <NoteOn Channel="1" Note="76" Velocity="76"/>  </Event>  <Event>    <Absolute>7920</Absolute>    <NoteOff Channel="1" Note="76" Velocity="0"/>  </Event>  <Event>    <Absolute>7920</Absolute>    <NoteOn Channel="1" Note="71" Velocity="76"/>  </Event>  <Event>    <Absolute>8160</Absolute>    <NoteOff Channel="1" Note="71" Velocity="0"/>  </Event>  <Event>    <Absolute>8160</Absolute>    <NoteOn Channel="1" Note="74" Velocity="76"/>  </Event>  <Event>    <Absolute>8400</Absolute>    <NoteOff Channel="1" Note="74" Velocity="0"/>  </Event>  <Event>    <Absolute>8400</Absolute>    <NoteOn Channel="1" Note="72" Velocity="76"/>  </Event>  <Event>    <Absolute>8640</Absolute>    <NoteOff Channel="1" Note="72" Velocity="0"/>  </Event>  <Event>    <Absolute>8640</Absolute>    <NoteOn Channel="1" Note="69" Velocity="83"/>  </Event>  <Event>    <Absolute>8640</Absolute>    <SequencerSpecific>05 0f 0f 02</SequencerSpecific>  </Event>  <Event>    <Absolute>8640</Absolute>    <NoteOn Channel="1" Note="45" Velocity="57"/>  </Event>  <Event>    <Absolute>8880</Absolute>    <NoteOff Channel="1" Note="45" Velocity="0"/>  </Event>  <Event>    <Absolute>8880</Absolute>    <NoteOn Channel="1" Note="52" Velocity="64"/>  </Event>  <Event>    <Absolute>9120</Absolute>    <NoteOff Channel="1" Note="52" Velocity="0"/>  </Event>  <Event>    <Absolute>9120</Absolute>    <NoteOn Channel="1" Note="57" Velocity="70"/>  </Event>  <Event>    <Absolute>9360</Absolute>    <NoteOff Channel="1" Note="69" Velocity="0"/>  </Event>  <Event>    <Absolute>9360</Absolute>    <NoteOff Channel="1" Note="57" Velocity="0"/>  </Event>  <Event>    <Absolute>9360</Absolute>    <NoteOn Channel="1" Note="60" Velocity="76"/>  </Event>  <Event>    <Absolute>9600</Absolute>    <NoteOff Channel="1" Note="60" Velocity="0"/>  </Event>  <Event>    <Absolute>9600</Absolute>    <NoteOn Channel="1" Note="64" Velocity="76"/>  </Event>  <Event>    <Absolute>9840</Absolute>    <NoteOff Channel="1" Note="64" Velocity="0"/>  </Event>  <Event>    <Absolute>9840</Absolute>    <NoteOn Channel="1" Note="69" Velocity="76"/>  </Event>  <Event>    <Absolute>10080</Absolute>    <NoteOff Channel="1" Note="69" Velocity="0"/>  </Event>  <Event>    <Absolute>10080</Absolute>    <NoteOn Channel="1" Note="71" Velocity="83"/>  </Event> 
              ...ETC...
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