SDRR - saturation chameleon
23 €

Download the free IVGI.
IVGI's base sound is comparable to the DESK mode in SDRR and gives you an idea, how SDRR performs quality-wise and CPU-wise. If IVGI runs smoothly for you, SDRR will do the same. Also, if you like what IVGI does, you'll love SDRR.
Download the manual for more information