by Hannes on 22 May 2012, 11:47
ok, I see you understand how he basics work, that´s good to continue!
in order to check if it´s hardware issue, can try recording thru audacity and apply the built-in riaa-amping after recording from vinyl.
[Audacity->Effects->EQ->RIAA]
If the result is the same it´s a hardware problem somewhere between the needle and U-Mix44.
If the result is fine, the vinyl-ripper software has a problem...