Thing is, none of these things offer the operational ease and instant gratification that arrangers offer.

The problem seems to come from the CONTENT of most arrangers made today, along with not just the feature set. Not only do they struggle with not having a proper modern arpeggiator, audio looper, and full synth parameter control from knobs and sliders, but the poor little dearies have to THEN wade past a style selection primarily geared towards their grandparents!

After all, when you bought your first arranger, how would you have felt if most of the content was for music virtually 100 years old?! Hardly anything newer than a Quadrille, or a Mazurka, or a Schottische, Valse à Deux Temps, Redowa, Five-Step Waltz and Varsouvienne! None of the styles to play rock and roll, R&B or cool jazz...

You would have avoided it like the plague, even if, buried under all that was the BEST way to make music easily.

Until someone steps up and combines the features and sounds that kids NEED with the styles they actually LISTEN to, and want to play, the arranger is a non-starter.

For the want of a nail.

Even THEIR music has intros, Variations, fills, breaks and endings. It's just that they are radically different to what is in most arrangers. Get the content and features right though, things like the Yamaha MX series don't stand a chance!
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An arranger is just a tool. What matters is what you build with it..!