Hello.
I have a short question.
I there a way to load midi files in Adobe Audition 1.5 for increase the volume?
And then to save in midi to. Is a plugin for this?
Thanx a lot.

MIDI is not a format that wave editors can handle. It is more like a musical score.
Try a demo version of a MIDI editor like e.g. midinotate musician

Yes, MIDI is not a file format it's specification that dictates how music software/hardware interact, etc. It's also a protocol. If you want you could download Timidity http://timidity.sourceforge.net/ which will convert your MIDI Sequences into audio data using Wavetable Synthesis (basically a collection of soundfonts) into PCM file like wav then you can adjust volume from there. With MIDI if you wanted to adjust the volume of individual instruments on each channel you could do it via velocity, etc. It can only be done with mixer or sequencer though.

Thank you all for you answers.
Understood
I have read somewhere about this two or three months ago, but i didn't know if this is true.
Thanx again.
have a nice day

... and welcome to Hydrogenaudio, yolyo!