Darren, .seq is a project file. All DAW's have their own proprietary way of saving project files. Once you finish your project you export it to mp3, cd audio, wav or whatever so other people can hear your work. Wav's as Mac said are just generic computer sound files and none of my audio programs save directly to wav because they don't use wav's as project files. Like you, I would hear sound out of my speakers and think, that's just audio right? Well, yes and no...

Bob

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