Developer Sobol Corporation has released S4 Rhythm Composer Pro – an iOS drum machine app that can be customized in various ways. The virtual drum machine includes 14 drum kits and you can create and save User Kits. It includes a 16/32 step Step Sequencer and Song editor, tone editing, audio import/export, real-time recording, AudioBus,… Read More New iPad Drum Machine, S4 Rhythm Composer Pro