consc.bcPost = doc.createBlendContext( postMaxLen, 0, source.validAudio );
span = context.getTimeSpan();
consc.blendPreSpan = consc.bcPre == null ? new Span() :
span.replaceStop( span.start + consc.bcPre.getLen() );
consc.blendPostSpan = consc.bcPost == null ? new Span() :
span.replaceStart( span.stop - consc.bcPost.getLen() );
progress = 0.0f;
// pt = new ProcessingThread( this, doc.getFrame(), doc.bird, plugIn.getName(), new Object[] { context, null },
// Session.DOOR_ALL );
pt = new ProcessingThread( this, doc.getFrame(), plugIn.getName() );