I don't know what the cycle region is. I purchased a program but it doesn't work. The biggest ***** is that it has worked but now it is hit and miss and mostly miss at that.
The Cycle Region - activated by pressing C on the keyboard or the circular arrows button in the Transport Controls - is a yellow ribbon that appears at the top of the Timeline and can be adjusted to any length. When it's visible only that portion will play and when you Share, only that portion will be exported.
How are you getting the vinyl to your computer?
I transferred my vinyl using a usb turntable that came with Audacity software but it's a freebie download, find it here:
http://audacity.sourceforge.net/