Append multiple MP3's into x.264 video?

[sentinelace]

I am trying to add multiple MP3's for a music video.  When I add a track it takes the first one, but then doesn't play any of the others.  My goal is for it to play 4 or 5 different mp3's, one after the other.  Any idea why it only plays the first one? 

[Jan Gruuthuse]

Assemble your audio track in audacity
Then add the assembled audio track as you would normally in Avidemux.

[sentinelace]

so is this simply an unsupported feature?  Why doesn't it work without another program?

[Jan Gruuthuse]

Avidemux is not an Audio editor, that is why.

Avidemux is a simple tool for simple video processing tasks. The keyword here is simple: it does not offer tools like a timeline, multitrack editing, you cannot freely move or splice audio and video clips from various sources. However, Avidemux allows you to do elementary things in a very straightforward way.

source: Avidemux