I am developing games on python, I need some easy to use software that can create sound files. Format can be anything .midi, .mid, .wav, .mp3 it doesn't matter. I can also download games sound from Internet, but I want to make my own sound for the games. The software must be easy to use, and if that software is lightweight that would be great!
You can use both the Linux MultiMedia Studio (lmss) at which seems to be an alternative or similar software to Fruity Loops, Sony Acid, etc. It allows you to sample audio files, insert percussions, read/write midi's, etc.
If you are familiar to Fruity Loops,Sony Acid and these style of software you will feel comfortable with LMMS.
Screenshot provided right here for your convenience:
Another great sound work station is the Energy XT, which is indeed proprietary (closed source), running natively on linux and these days they have a "free" version which allows you to do some limited things like saving but including only 1 synth, 3 percussions and these things. The fancy of this is that it is really easy to use and it runs natively on linux.
Videos can be reached right here: http://www.energy-xt.com/index.php?id=0101
And a screenshot from my desktop for you to see the full version of energyXT at work is also here:
Both these are ready to run, but if you wish try finding alternatives to these applications, I suggest you this site: http://alternativeto.net/ on which you can perform searching for almost any known application.
Good luck!
