I apologise if this seems a silly question, or has been asked on this forum before, but was exactly constitutes an "arranger" keyboard ?. A friend has just bought a beginners keyboard ( a Roland EM15 ) for their son, saw the term in the Roland blurb and asked me what it meant. I couldn't answer. I have a KN6500 and an old PSr5700. Are they both regarded as "arranger" keyboards, and if not why not ?. Conversely, what other types of keyboard are there, or is the term "arranger" just a tag that the manufacturers use to impress ?.

Thanks in anticipation

Keith