B-Step Sequencer screenshots

Lets you create melodic loops, chord progressions, arpeggios, and drum grooves.
B-Step Sequencer 2.1 : Main Window

Alternative downloads

KikAXXE
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KikAXXE supports RTAS, AU Instrument, AU Effect, VST Instruments

WejaamDesigner
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Helps you create grooves and drum loops by combining various utilities.

Factory
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It is a modular synthesizer providing unlimited connectivity between modules.