Sound recorder crash

Hi all,
I'm having some trouble with the sound recorder. I want to use OpenSesame for a basic video elicitation, where the participant watches video and narrates the actions. I've set up the basics in the experiment

But when I run it, it throws an error.

Stopped

The experiment did not finish normally for the following reason:

Unexpected error
Details

item-stack: video_elicitation_task[run].video_stimuli_loop[run].video_stimuli_sequence[prepare].start_recording[prepare]
exception type: ImportError
exception message: No module named muxer
time: Mon Aug 21 11:27:30 2017
Traceback (also in debug window)

File "/Applications/OpenSesame.app/Contents/Resources/lib/python2.7/site-packages/libqtopensesame/runners/inprocess_runner.py", line 38, in execute
self.experiment.run()
File "/Applications/OpenSesame.app/Contents/Resources/lib/python2.7/site-packages/libopensesame/experiment.py", line 411, in run
self.items.execute(self.var.start)
File "/Applications/OpenSesame.app/Contents/Resources/lib/python2.7/site-packages/libopensesame/item_store.py", line 91, in execute
self.run(name)
File "/Applications/OpenSesame.app/Contents/Resources/lib/python2.7/site-packages/libopensesame/item_store.py", line 106, in run
self[name].run()
File "/Applications/OpenSesame.app/Contents/Resources/lib/python2.7/site-packages/libopensesame/sequence.py", line 51, in run
self.experiment.items.run(_item)
File "/Applications/OpenSesame.app/Contents/Resources/lib/python2.7/site-packages/libopensesame/item_store.py", line 106, in run
self[name].run()
File "/Applications/OpenSesame.app/Contents/Resources/lib/python2.7/site-packages/libopensesame/loop.py", line 337, in run
self.experiment.items.execute(self._item)
File "/Applications/OpenSesame.app/Contents/Resources/lib/python2.7/site-packages/libopensesame/item_store.py", line 90, in execute
self.prepare(name)
File "/Applications/OpenSesame.app/Contents/Resources/lib/python2.7/site-packages/libopensesame/item_store.py", line 122, in prepare
self[name].prepare()
File "/Applications/OpenSesame.app/Contents/Resources/lib/python2.7/site-packages/libopensesame/sequence.py", line 124, in prepare
self.experiment.items.prepare(_item)
File "/Applications/OpenSesame.app/Contents/Resources/lib/python2.7/site-packages/libopensesame/item_store.py", line 122, in prepare
self[name].prepare()
File "/Applications/OpenSesame.app/Contents/Resources/share/opensesame_plugins/sound_start_recording/sound_start_recording.py", line 96, in prepare
soundrecorder = imp.load_source("Soundrecorder", path)
File "/Applications/OpenSesame.app/Contents/Resources/share/opensesame_plugins/sound_start_recording/Soundrecorder.py", line 35, in
raise e
ImportError: No module named muxer

There's this discussion that indicates my problem has to do with the pymedia-mac combo. http://forum.cogsci.nl/index.php?p=/discussion/2120/problems-with-sound-recorder-mac-os-x#latest

It's over a year old. Have there been any updates on this issue?
best,
-Bob.