StepSeq is a free Max for Live patch that turns Launchpad (pictured) into a melodic step sequencer. Conceived as a sequencer to allow Launchpad users to program melodies, leads and bass lines quickly in Live, the buttons are configured diatonically (as opposed to chromatically). The degree of the scale and its tonal center can be set by the user, meaning that, once set up, any note a user triggers in a sequence will fit in harmonically with the track..
StepSeq is a MIDI effect that generates a sequence of notes that can be used to play any instrument compatible with Ableton Live (including those from third-party developers). Once inserted, StepSeq communicates directly with Launchpad, transforming its User 2 mode into the interface for a step sequencer so users can program patterns quickly and simply on the fly, while retaining control over Live from the same control surface.
The round buttons on the right-hand side of Launchpad are used to determine which parameters the grid of square buttons will affect so that users can alter the velocity, pitch and length of notes. An additional Probability function lets users set the likelihood that a note will be triggered to add interesting variation to sequences.
Ableton Live 8.1 and Max for Live are both required for Novation's StepSeq to operate. Currently, using StepSeq and Live's CS Step Sequencer (which is ideal for drum programming) simultaneously with Launchpad results in conflicting LED update messages. This will be resolved in forthcoming updates.