Back to the original question (at least from what I understand as original question - "If ModX can serve as standalone arranger")
Definitely yes. And possibly even better than a traditional HW arranger. With almost the same "play it immediately out of the box with no fuss" factor.
We have developed a program to do exactly that: transform a MODX/Montage into an (HW) arranger!! Check
www.groovyband.live/modx for all the details. Further expansion packs are in the pipeline and will be added over time.
You can also look at a few videos to see it in action, listen to many audio demos, and also read the manual. Of course you can download a fully functional demo and play with the bundled styles, so that you exactly know what you get (and hopefully best appreciate the software).
Only a few highlights here:
* 1800+ top quality preset sounds (no fillers here!!) with 2 variations each, further perfected and integrated from the stock Montage sounds. Native FMX synthesis. Massive use of DSPs (up to 32 inserts all at once, 24 on MODX). Arranger style (= simplified) editing to create unlimited user sounds.
* 8 Variations styles (including 3 intros/endings and 2 breaks). 8*2 OTSes (with smooth, glitch free, transition).
* 2nd keyboard + pedalboard (or 3rd keyboard) sounds (programmable split/layers) + line-in DSPs managed directly from style setting.
* You can use many MODX/Montage buttons, sliders, knobs to trigger actions (i.e.: fill-in, variation change, ...) + any external MIDI controller (up to 4 midi inputs).
* Touch enabled, high resolution, user interface that seamlessly scales to any screen size/pixel density.
* The software uses only the MODX/Montage performance buffer (a volatile memory location used to load and play the "current" performance), programmed on the fly trough USB. So absolutely NO internal memory location is overwritten. When you shut down Groovyband Live! the MODX/Montage is exactly as it was before. The synth<-->arranger transformation is perfect and takes only a few seconds!!
You can also upgrade any existing Yamaha XG arranger (PSR S/SX, Tyros, Genos, and others, including digital pianos) to this feature set. Check
www.groovyband.live/xg.