Hi Yves

First of all, if you want new sounds and do not mind making your set up more complicated, keep your old keyboard and add a sound module. Instead of a new arranger, get a Roland 5080 or a Triton Rack. Each comes with great sounds and each has eight expansion slots for new sounds and more.

If you do buy a new arranger keyboard without the features you mention, maybe you can hook up your old keyboard so that it shows the chord and note information played on the new keyboard.

I use a Roland A-110 Midi display, which shows notes on a Piano-style display. It does not show chords, however. Most new high-end arrangers can display lyrics. Many arranger keyboards display chords as you play, but not when a file is played. In a speculative vein, if the keyboard allows the auto accompaniment to be controlled with an external midi controller, there might be a way to feed back song data to drive the autoaccompaniment and read the resulting chord.