Here is the Audiology leaflet for the RS 195 that shows the different sound profiles A-G on a frequency graph but also gives you an indication on what profile is best for you. Please bare in mind that the RS 195 does have sound a limiter which can be switched off in Passive mode.
A,B: Attenuate mid and high frequencies, boost for low frequencies
C: Neutral profile = no amplification, no frequency shaping, but compression
D, E, F, G: Attenuate low frequencies, boost high frequencies
NOTE: The attachment is a PDF file