Amplify a wav file and join wav files under Lenny

["Josep M." <websurfer@navegants.com>]

Hello.

I need amplify 3db a lot of files, the best will be using linux command
line...there is any tool what can do this?

Also, I need join wav files from command line ...there is any tool what
can do this?

I use Debian Lenny.

Thanks
Kokolisso