Xplorer

Hello ! i'm a newbie and i wonder if it's difficult to build a midibox based sequencer/arpegiator. i'm quite lost here and some advices would be greatly appreciated ;) like the midipal, here : http://mutable-instruments.net/midipal i'd like an arpegiator seen on the sequential circuits pro one for example. But with a different architecture, not a screen with chapters inside .. i'd like it with encoders, switchs ... direct access to the features i need. Also, 24 steps for the sequence recorded manualoy on a keyboard and looped, transposable with the keyboard. the sequence recorded manualy should play back only the note heights, not the velocity and note lenghts ... like a recorder. then, the first 24 note of the sequence could each be adjusted with encoders for their individual velocity, note lenght, volume, so 3x24 encoders. a button to rest the values of each of these 3 lines, to a standard value. a little screen for each encoder, telling the value, would be great. a switch to record the incoming midi messages, a switch to play the sequence .. also a general tempo encoder, synchronisable with cubase for example, and another section for the arpegiator, just like the midipal. this is maybe too complex, especialy since i have no idea how to build a midibox project. is this project already existing maybe ? so i could clone it ... and load the already coded software inside ... or i should just buy the midipal box. thanks !