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Alexander Pedals is known for primo digital goods and the F.13 is no exception. The F.13 is an all-in-one flange machine with several unique modes available. Step mode forces the LFO to "step" up and down at fixed intervals rather than a smooth wave. This makes for interesting arpeggio-type effects. Sweep mode is a traditional flanger mode utilizing a "hyper-triangular" wave so that the LFO spends more time in the "flanger-y" spots rather than the boring ones. Finally, Dynamic mode adapts the flanger's delay time to be controlled by input volume, or picking sensitivity. Controls for Rate, Depth, Mix and Regen (feedback) round out the feature set, making the F.13 a versatile box indeed.