The reference implementation is Paul's stand alone version: http://hypermammut.sourceforge.net/paulstretch/
The Audacity plug-in is a simplified version of that.
The reference implementation is Paul's stand alone version: http://hypermammut.sourceforge.net/paulstretch/
I've no idea what you mean. To record 2 channels (stereo) in Audacity you have to set the number of recording channels (in the Device Toolbar) to 2 channels.