While I was sequencing the Chopin concerto and playing the sequence back with the JV1080 alone, I noticed that when the piano was playing with the orchestra, some notes of the orchestra suddenly dropped out indicating a lack of polyphony. This ruined the harmony and effect I was trying to create. The Roland JV1080 has 64 voice polyphony. This does not mean that 64 notes from different instruments can sound at the same time.
Some instrumental patches require more than one voice.
For example the GM pizzicato strings patch requires one voice but the acoustic piano requires two voices. Anything more than the maximum number of voices will cause drop-outs in notes. I solved this problem in a very simple way and achieved a magnificent orchestral effect. The midi data for channel 14 was being sent via the midi through connector to the Yamaha Clavinova and the notes of the piano were heard on it. There are probably other ways of diasbling a midi channel on the synthesizer.