Arpegg is a simple bass arpeggiator. Its idea is similar to the Roland TB 303, albeit with different sounds which aren't adjustable.
It's for people who want a quick and easy bassline or for people that like Halcyon's other product, Drumatix 232, and want a bass line accompaniment.
NOTE: Every time you close Arpegg, your last unsaved pattern is kept in a file called 'Scratch'. This is useful if you are working on a pattern and you accidentally quit Arpegg. Please be aware that the Scratch file is not a substitute for a saved pattern, as loading from the Scratch file only occurs on opening the application and saving only occurs on closing it.