Modstep is a Sampler Sequencer jam tool allowing you to sequence, play with and modulate any MIDI gear, be it hardware, software or apps that support MIDI. It features unlimited Tracks and Scenes and up to 128 MIDI CCs on each Track. On top of this you can integrate, control and mix IAA apps and Audio Units, use the internal Sampler and Synth and stream audio and MIDI using Studiomux directly via the charger cable to and from your Mac or PC.
You can find the Modstep Manual Here:
And watch the excellent tutorials by Jakob Haq Here: