Hey all, new to this forum and keyboards in general. I'm thinking of purchasing a Yamaha DGX 660 and had a couple questions. Read a lot of reviews and in some they referenced the 6 watt amplifiers and onboard speakers don't produce a lot of volume. I'm not interested in blasting out sound, but wondered about playing with other instruments that use amplification. Can I use an external amplifier with this keyboard? Should I plan on having to use external amplification if playing with others?It looks like I would need to use the headphone jack to out put to an amplifier or PA system. Am I on target here?