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QMidiArp is a MIDI arpeggiator, phrase generator and controller LFO for ALSA and JACK. It can run multiple synchronized arpeggiators, LFOs and step sequencers. QMidiArp has been growing since june 2009 on top of Matthias Nagorni's original arp idea.
More information is on the QMidiArp Website.

Step Sequencer module

LFO module

A four-module setup

Arpeggiator module

Global Storage / Pattern Switcher

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Summary of features:

• Programmable arpeggio patterns with preset infrastructure
• Pianoroll-type display of arp patterns and cursor line
• Envelope function for chord arpeggios with high polyphony
• Latch mode or Footswitch for holding notes in arpeggio buffer
• Synchronized MIDI LFO modules: LFOs have calculated and drawable waveforms, selectable frequency, amplitude, offset, time resolution and length
• Waveforms can be recorded from a MIDI controller
• Synchronized step sequencer modules: Sequencer can be transposed and velocity-modulated by received notes, sequence can be drawn on the fly
• Keyboard-triggered or -restarted modes for all modules
• Small input note delay making QMidiArp suitable for live play
• Random and Groove functions
• MIDI-learnable control of many live-relevant functions
• MIDI-controllable Global storage panel for Live switching between setups
• MIDI realtime clock slave synchronization (ALSA MIDI only)
• JACK transport client synchronization
• MIDI Event log with color-coded entries, optional MIDI Clock event display
• Re-designed graphical user interface: all modules and dialogs are dockable floatable windows, main and file icon toolbars available
• All relevant session parameters stored in new .qmax XML session file
• Manual pages and i18n support in English, French and German
• JACK and ALSA MIDI backends
• LADISH level 1 support
• JACK Session support