This app is perhaps fun to use and as such, a toy, it’s pretty well designed. Unfortunately, it is seriously crippled if you want to use it for more serious applications. The reason is the lack of ability to create your own scales. Any decent arpeggio generator allows at the minimum a creation of your own scale. This app is missing all 7th chord scales which are a must in any music, same goes for augmented and diminished scales. Yes, you can create some of those by using a chromatic scale and then finding a combination of notes distance but then you are limited only to that very specific note distance (I was able to create a diminished scale this way but that is only because of its symmetrical nature, very hard if not impossible to create 7th scale). In addition, surprisingly the app does NOT offer ability to create arpeggios on the fly based on the notes you press on a MIDI keyboard or the built in keyboard (which is there only to provide visual representation of the arpeggio) - this is something that almost every arpeggio generator has, both software and hardware. All you can control with the incoming MIDI is either changes of patterns or programs, NOT individual notes! I noticed that this developer does not like 7th chords / scales as they are also missing in the Fugue Machine preset scales, but since in Fugue Machine you can input your own notes using chromatic scale, this is not a big problem. Phrygian scale is included but nothing 7th scale (Phrygian scale can be achieved simply by starting on the 3rd degree of a major scale, no separate scale needed). All in all, this app has a great potential but is leaning on the side of being a gimmick, a toy and not a more serious music creation app. Another note, the video included in the Preview above on the App Store is misleading and suggests that the matrix can take multi touch (there are two points in performance matrix and two flashing cross hairs). This is not how the app works, in fact it states in the manual that “when the performance matrix receives multiple touches, only the last touch is active”.
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