I saw on the General Arranger Keyboard Forum where George Kaye, a dealer in California said he just got one in his store and was trying it out. He had some comments, so you might want to look there. I posted a question to him, and any others that might want to answer, trying to get some info as to how the PX400R or the PX300 would work as a MIDI controller to control a 61 key keyboard. I haven't gotten an answer yet. One of you two said that the PX100 got a good review, somewhere. I wonder if a PX100 would work just as well for me as one of the other two? Or, do either of you have any suggestions as to another board I might consider, to use for a midi controller. All responses and info will be greatly appreciated.