#0  0x00000000005bbd3f in instrumentTrack::processOutEvent ()
#1  0x0000000000523b3b in notePlayHandle::notePlayHandle ()
#2  0x00000000005b8881 in instrumentTrack::processInEvent ()
#3  0x000000000056648f in piano::handleKeyPress ()
#4  0x0000000000566c8e in pianoView::keyPressEvent ()
#5  0x00007f58d04d086a in QWidget::event () from /usr/lib/libQtGui.so.4
#6  0x00007f58d047f83d in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#7  0x00007f58d048896f in QApplication::notify () from /usr/lib/libQtGui.so.4
#8  0x00007f58cf85075c in QCoreApplication::notifyInternal ()
   from /usr/lib/libQtCore.so.4
#9  0x00007f58d0514764 in ?? () from /usr/lib/libQtGui.so.4
#10 0x00007f58d0516ac2 in ?? () from /usr/lib/libQtGui.so.4
#11 0x00007f58d04ef66d in QApplication::x11ProcessEvent ()
   from /usr/lib/libQtGui.so.4
#12 0x00007f58d0518514 in ?? () from /usr/lib/libQtGui.so.4
#13 0x00007f58cbd8420a in g_main_context_dispatch ()
   from /usr/lib/libglib-2.0.so.0
#14 0x00007f58cbd878e0 in ?? () from /usr/lib/libglib-2.0.so.0
#15 0x00007f58cbd87a7c in g_main_context_iteration ()
   from /usr/lib/libglib-2.0.so.0
#16 0x00007f58cf879e6f in QEventDispatcherGlib::processEvents ()
   from /usr/lib/libQtCore.so.4
#17 0x00007f58d0517c9f in ?? () from /usr/lib/libQtGui.so.4
#18 0x00007f58cf84f002 in QEventLoop::processEvents ()
   from /usr/lib/libQtCore.so.4
#19 0x00007f58cf84f3cd in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#20 0x00007f58cf851694 in QCoreApplication::exec ()
   from /usr/lib/libQtCore.so.4
#21 0x0000000000593b4e in main ()