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.SoundFonts are an open standard for wavetable synthesized audio, developed by E-mu systems and Creative Technologies.REX files are music loops created in the ReCycle program or when editing audio clips inline in Reason Essentials (see “Bounce Clip to REX Loop”). Redrum lets you load separate slices from REX files as individual samples.