I'm trying to get my M-Audio Firewire Solo to work with garageband to record piano via 1/4" cable from my left, or right, main out on the keyboard to the 1/4" "guitar" input on the interface; I'm getting nothing. The computer itself is picking up a signal when I check the input levels through my MacBook's "System Preferences," and I have garageband's preferences set for the interface as the input and the computer's built-in output. Any suggestions? I've tried everything.

SOURCE: m-audio firewire 410 on macbook

Use a 'Y' splitter. Usually from balanced to unbalanced. Also try looking at your device's control panel and see if you can change the channel options from mono to stereo. Beta drivers are for testing purposes, so try the signed driver also.

SOURCE: Low record level for guitar

first of all you want to have your guitar amp at a decent volume but too loud, just enough to be able to get a good signal. when you have done this turn up the gain on your mic channel so that your VU meter (level meter) on the recording software shows a reading of about half way up the meter. If you can not achieve this with the soundcard alone increase the gain on your channel in the software.

This sound guarantee a good signal but as with most recordings you will still have to boost the signal without it peaking. to do this use a compressor or a limiter and turn the gain up. if you use these dynamic effects correctly you will achieve the guitar level you want.

SOURCE: m-audio firewire solo

I just bought the Firewire Solo and had the same issue with my MacBook. I have OSX 10.5.6. The drivers that came on the CD were for earlier OSX version. If you go to M-Audio's website (www.m-audio.com) and then click on Support. Go to to drivers & updates, search by the criteria they give you for your specific system and then download. Although they don't currently have an updated version for 10.5.6, I downloaded 10.5.5 and it seems to be working, although I'm running into an audio input problem when hooking up mic and guitar....no sound. I'm thinking I'll just have to wait until M-Audio comes out for an updated version for 10.5.6. Hope this helps.
JD 

SOURCE: using m-audio fast track usb with Behringer mixer

Use the taope outs. They're the RCA plugs located in your manual as "20".

SOURCE: I HAVE AN M-AUDIO FAST TRACK ULTRA. I PLUG IN A

You need to get direct monitoring turned on