Firstly, can I say how great the video guide to using Audacity was - I have a HP Vista laptop and found the paper instructions not relevant to Vista.
The problem I have is during the tutorial, there are instructions referring to a tab box to select microphone / line in on Audacity. On my copy (bought on internet) there is no such tab option. I can record using the laptop microphone but prefer to record records via amplifier to the computer. I have followed the instructions but without success. I guess inability to select line in may be the cause but value your suggestions