Yes, it is possible to trigger chords on an Arranger Keyboard with the help of a MIDI Pedal Board.
You must set the Arranger to One Finger Chord Mode.
All the major chords like E, A, B can be played by pressing the corresponding note on the Pedal Board.
Minor Chords like Am, Dm will require two note operation. You can hit two notes with the heel and toe of your left foot, leaving the right foot to control the expression pedal. It requires a little bit of practice.
Check these out:
Roland PK-5A MIDI Pedal Board (13 Keys)
http://www.instrumentpro.com/P-ROLPK5A?source=froogle Hammond XPK-100 MIDI Pedal Board (13 Keys)
http://www.musiciansfriend.com/srs7/search/detail/base_pid/706506/src=01340 Roland PK-7 MIDI Pedal Board (20 Keys)
http://www.audiomidi.com/PK7-MIDI-Pedal-Board-P6198.aspx?CPID=392&AFID=3 [This message has been edited by Tapas (edited 11-27-2005).]