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The Expert Sleepers mk4 builds on the previous mk3 and adds these new features:Dot matrix display, making menu navigation, parameter selection etc. a breeze.a front panel accessible MicroSD card slot.Compatibility with the Macro Machines Storage Strip.An internal precision clock allowing new algorithms such as a tuner, and pitch and frequency references.The new version is largely software-compatible with the mk3, and the intention is to continue releasing new features for both the mk3 and mk4 in parallel.