About file formats Redrum reads two basic types of files: Redrum Patches A Redrum patch (Windows extension “.drp”) contains all settings for all ten drum sound channels, including file references to the used drum samples (but not the actual drum samples themselves). Switching patches is the same as selecting a new drum kit. Drum Samples The audio file format support differs depending on which computer OS you are using. Redrum can read audio files in the following formats: • In Windows 7: .wav, .aif, .mp3, .aac, .m4a and .wma. • In Mac OSX 10.7: .wav, .aiff, .3g2, .3gp, .mp1, .mp2, .mp3, .mpeg, .mpa, .snd, .au, .sd2, .ac3, .aac, .adts, .amr, .caf, .m4a .m4r and .mp4. • SoundFonts (.sf2) SoundFonts are an open standard for wavetable synthesized audio, developed by E-mu systems and Creative Technologies. • REX file slices (.rx2, .rex, .rcy) REX files are music loops created in the ReCycle program or when editing audio clips inline in Reason (see “Bounce Clip to REX Loop”). Redrum lets you load separate slices from REX files as individual samples. • Any sample rate and practically any bit depth.