Mixere is a great open-source audio application that lets you mix different audio tracks. It supports many formats including mp3, ogg and wav and can be used for instance at parties to mix the music live.
It is possible to fade in and fade out of tracks, loop and auto-trigger audio, and change the volume of the audio on the fly. All songs are loaded right in the main interface of Mixere with each audio file filling one track in the software. Any number of audio files can be then played simultaneously as well which according to the developers is only limited by the operating system and sound device.
This can be interesting if you want to play samples on the system for instance. I can't really see it work well with different songs on the other hand, other than using the fade out and in feature of the application. It may however work if you have songs that work well together, or just samples that you want to mix together.
Mixere can be used to arrange songs for a party by playing them one after another fading in and out of the audio tracks at the end and beginning of each song. I advise you to take a look at the excellent tutorial that has been posted on the Mixere website which explains all the features in depth. It may take some time to get used to audio mixing but it surely is worth that time if you are really into it and especially if you are the one who is always playing music on parties.
To use the program select File > Load Audio from the options and pick the audio files that you want to load into the program. You may also want to check the View menu to hide or display various program features in the main toolbar. Here you can for instance display a master volume slider - handy if you suddenly need to mute the music, for instance before a speech - and other features such as the cross fader or tempo slider.
It definitely takes a while to get used to the various features the application makes available. Once that is out of the way though, you do have access to a powerful audio mixing tool that you can use for a variety of purposes.
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