Recently I found this website offering presets for use with Guitar Rig 4 and Guitar Rig 5.
Many downloads are free with a premium service available.
3,600 presets for $50 and $33 for a limited time (pay with paypal)
After trying the free downloads the sounds of the presets seem of a good quality and are possibly better than the presets that come with the software.
http://guitarrigpresets.com/
In the free downloads were some really handy sounds and the acoustic simulator was particularly good. Well worth a try.
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