Hi
your suggestion was very helpful as we did it and were succesful.....but with a slight change in hardware part.... Instead of using 3.5 mm jack as u described we used our speaker box's 3.5mm jack.we fixed one end to the computer blue port and the other end into our small tape recorder earphone jack.......and this really worked,,,,,,actually we have a seven year old boy and we had his voice captured in that cassette (2mnths to 1 and a half year).......and we it wid ur help.......so we r vry grateful ......thank you from our heart......