Dp4 And Recording Audio Via Usb Interface, i cant get a signal,help!!!!! Options

[dtl1232]

heres my setup: i book g3/500mghtz
m-audio mobile pre usb interface
audio technica mic

heres my problem: i am new to dp4 and i cant get a signal when i am trying to record a vocal track.i know the interfaces of pro tools cubase and deck but this is alot more intense like logic im sure.i have my hardware configured correctly so the input and output are showing mobile pre as selected then i hit the record arrow but no VU meter light or anything.also if i import audio, how do i get it to be on an audio track? in pro tools for example you have the tracks under each other with the waveforms showing as you record and edit,how do i get dp4 to do this? i opened up soundbites and saw the waveforms of the audio i imported, but in order to playback any of it i have to highlight it then it plays but i want to put it on a track and put vocals with it,help!!! i dont mean to sound like a complete retard,i just dont know this interface.thanks in advance for replying and explaining like i'm 5 years old

[newrigel]

It's VERY important that you keep your sessions @ the same bit depth and sample rate throughout your work history on your machine that way you don't have to worry about a project not working correctly and you can get right to work instead of convrting things to work in a given project. I can see if your importing a file from the outside of a session but then just converting 1 or 2 files isn't a pain. Make sure when your in the soundbites window that you export the stereo file as an "intrleaved SD2" in the export dialog... that way the file is one stereo track instead of a dual mono stereo track.