A while back, I got a turntable for my Birthday. The Numark TTXUSB. I'm very happy with it, and last week I started to transfer some 78s via USB to my computer, and to my surprise, the USB worked very well (I'll leave a couple of examples below), until I got to E for Edison. I reversed the ground leads on my cartridge and tried to record it. From what I can hear it sounds ok, but it's very low, so I tried to amplify the sound in Audacity. I have done the same with 78s to make them a bit louder, but the only thing that got amplified when I did it with a Diamond Disc was the surface noise. Anyone that knows what I can do to make sound louder so I can actually hear the recording? Any help will be greatly appreciated!

An acoustic Brunswick:
https://www.box.com/s/223cc9d9434622f27b75
An electric Columbia:
https://www.box.com/s/bc46ee681f0889e65107