The Moog Piano Bar looks very easy to add to an acoustic piano. Very useful for people that wish to move it around from piano to piano.
You can find info on the Gulbransen piano converter at
http://www.gulbransen.com/prod02.htm It now appears to be distributed by QRS Music
http://www.qrsmusic.com/ [This message has been edited by Nigel (edited 07-19-2003).]