Worked well for about 6 month, now i'm getting a lot of noise when i turn the knobs or just listening to an mp3

PreSonus complains a lot about the problems in their hardware being caused by Apple (in the case of non-functional and late-released OS X updates).

Be aware that the software will take some time to learn, but PreSonus provides an awful lot of free guidance, tips, and instructions

Lost a lot of time and had to do a lot of debugging to figure out what the problems were

oh yeah, a lot of people have trouble with it'.

(From 1 star to 3):After lots of fiddling about and a healthy amount of trial an error, it's finally working on a regular basis.

n’t blame them for being unable to fix your problems, because really the 1818SLV is hopeless.