Garageband output volumes in relation to other sequencer output volumes....

First, let me say that I am aware of that tab you can uncheck in garageband preferences that will allow your song to be output at/around its actual final mixed level, instead of having it output at a lower volume if this preference is checked. This is not the nature of my post.

What I am wondering is if other sequencers (Logic, Record, Pro Tools, etc) have higher output volumes than garageband. I for the life of me can't get my garageband outputs to the desired 'radio friendly' volumes that I hear in other music I listen to or purchase. When I push the output volumes to the desired level, it always comes out distorted when the final mix is sent to itunes. I do use an ART Tubepac preamp/compressor so I'm certain I am able to get the recording level I want when recording vocals, guitars, etc....but again, when it comes time to mix it all down, the highest volume I can output my recordings at without clipping/distorting when sent to itunes is just too low for what I need (writing some background music for television). When I compare it to everything else in my itunes (professional recordings), it comes out much quieter. Now I realize I'm not going to get the ultimate professional sound from the minimal gear that i use (ART Tubepac preamp/compressor, M-Audio interface, GrooveTubes condensor mic), but my outputs should be louder for sure.

Anyone else ever use another sequencer and found it allows for louder final outputs than garageband?