Someone mentioning that they use digital recordings of the drill patterns to help them study. If you get a local to record their voice saying each sentence as a separate file, then you can play them back in random mode. This prevents you from memorizing the drill pattern order, and improves listening comprehension.
Does anyone do this using a digital voice recorder? If you do, what brand to you recommend? I went to the market, and there are about 30 different models. Also, are there any special features that come in handy when using it to study Chinese?