We don't use the E423 for "electronic music"...it works real well on tunes from the 70's and 80's that have analog synths (especially with filter sweeps) in them. The relatively inexpensive little arranger does an admirable job of mimicking the older analog synthesis, and that's just what we were looking for. It's really quick and intuitive, especially to those of us who grew up with analog synths. It's another "player's" instrument due to it's real time controls...the knobs work great and are not cheap feeling in any way.
The PSR-E433 is the newer model and has several extra features, but still retains the knobs.
I rarely listen to, or perform, Trance/Rap or any of the newer stuff...it just doesn't appeal to me, and I now have the luxury of choice.
Different strokes...
Ian
PS...I am in complete agreement with Bachus in having hardware knobs (and sliders) on a future arranger...controls that will affect the sound in real time, and those controls being able to transmit info over MIDI.
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.