ok, so i bought a mixer off ebay and its a behringer eurorack ub802, and im having a few problems setting it up. it works if i plug my bass into its line in and then its "main out" into my pc's line in, but because its my first mixer im not sure that this was right. i have a feeling that your meant to put your bass into it via your amp, but when i tried this the computer does not pick up any sound when i play my bass . im using cubase sx3 and a marshall mb15 amp. also ive checked everythings working on their own PLEASE HELP!