So, if you want the JV 1000 to take charge as the controller and the RA 95 to be the slave, here's what you gotta do. First, make sure both keyboards are connected with a MIDI cable. Then, dive into the settings of the JV 1000 and look for the MIDI setup options. From there, you should be able to assign the RA 95 as the slave. Give it a shot and let me know if it works!