i am having trouble recording my midi keyboard psr 295 usb interface. the problem is e.g if i record on a midi track from the keyboard e.g only bass part. and then try to record a string section on another midi track. so as i change the voice in the 2nd midi track as string the voice i get from the 1st midi track which was bass, now also becomes strings voice. i.e both tracks play with the same voice selected on the keyboard.