Hi just a suggestion,
Would this be useful?
Assignment Type: Nanogong Assignment Type
Type: Assignment Type
Requires: Moodle 1.9
Status: Contributed
Maintainer(s): Dan Poltawski (Lancaster University Network Services Ltd)
The nanogong voice recording java app as an assignment type. Please note that in Moodle 2.0 and beyond this is probably best achieved by using the nanogong repository plugin and upload file type.
http://moodle.org/mod/data/view.php?d=13&rid=2882
Good luck!