Hi All

Although it does not have a 'chord sequencer' per se, the Roland EXR-7 (note only the 7 not EXR-3 or EXR-5) has a full piano mode for playing arranger styles. This allows you to play the 76 keys in a piano style and have the arranger follow you with correct backing chords. This feature is the reason I bought the EXR-7. It also allows chord inversions to be voiced properly.

It is available also on the Korg PA-80 but needs to be set up properly. I have not seen a lot of other makes of arranger other than Yamaha and Casio but have never seen this feature on other keyboards.

Cheers

Kevin