Okay here we go, whats still missing....

- pads... (Selectable from main screen)
- arpegiators ( as in the korg and tyros pads)
- tempo controll (frontpage switch that overrides the preprogrammed style tempo)
- OTS
- special kontakt soundsets for Roland, Ketron, korg and Yamaha styles..
- (vst) instrument list... ( this is a list where you can choose the presets and user sounds in a VST including the VST effects chain ) this will allow the player to easilly choose the VST sounds he saved in the list withouth going trough the process of configuring the whole VST each time they want to use a sound)
- allowing atleast 32 VSTs trough your VST host..
- using VST effects for the SF2 sounds
- a master effects section...
- rewire capabillity.
- atleast 4 variations, fills and intros
- Harmony feature (on front screen)
- programmed ensemble mode... (If you understand how T5 ensemble feature works, it can be programmed easilly as it is just a matter of if then else statements and while do loops)
- support for audya audio styles (probably will require a license of elastique)
- build in music notation score reader


And when you are done with copying what current arrangers offer, you need to add things in demand by users that the hardware arrangers dont offer
- 2nd screen support
- support for MAC OSX
- an own advanced style format, supporting like 16 tracks and 8 variations, intros, endings fills but also the specifics of your attached VST sounds including settings
- a matrix mode... Like ableton or the yamaha mobile music sequencer, but not launching clips, but style parts...
- dynamic styles mode, with style volume reacting to how hard you play your chords, and styles dynamically switching variations on how you play your right hand ...
- get a deal with Steven Kay, to build in Karma intoo the Varranger... Could be an option, developed by steven kay and sold by steven kay...
-support for the new komplete kontroll software in your arranger...

All in all, its a long list, but on the long run, you need to offer things, that the hardware does not offer, because as soon as you have more features and better sound then the hardware arrangers, you will be in high demand..


And i guess all other arranger players overhere might have some very usefull wishes too