1st problem: I am running an RCA from my mic jack in my labtop to my mixer...This only allows me to record from one turntable...I got the special adapter, or spliter, that divides the RCA to 4 diff. cords inorder to fit my Line1 and Line2.....I was hoping this would allow me to record from both turntables......but it doesnt work.

2nd problem: After I record from one turntable the playback is really faint. Any ideas?

If you are familiar w/ the mixer it is a PMC-05 ProII, if that will help

1.might be fualty spliter (take it back)
2.might be in the settings in sound forge
3. could be you sound card doesnt like you
4.when all else fails its prob simple its a connection prob (99% its a simple connection prob)
4. i didnt help

2nd problem: After I record from one turntable the playback is really faint. Any ideas?
i had this prob when doing a mix on my pc then i reinsalled the prog and it was fine
or try adjusting some settings in your volume control on your PC like, line in or midi etc
hope this helped in some way