I'm an owner of a DGX-650, the previous generation of the DGX. The DGX series is meant to be primarily a home electronic piano, with a bunch of sounds you can play with an simple arranger features. The sequencer is only six tracks. On the other hand, it supports the traditional three pedal piano setup and has built in speakers. It's really meant to work by itself, and does so very well.
- No, I just plan to use it at home to teach myself piano/keyboard and probably make my own beats/tracks.
Here's the rub. The arranger in the DGX uses pre-existing rhythm patterns. You can also add new ones purchased from
www.yamahamusicsoft.com. But to create your own beats/tracks, you'll need software. Luckily for you, there's a healthy community of Yamaha arranger users at
psrtutorial.com that have written all sorts of software, much of which can be used on the DGX. (On the other hand, a full blown arranger has far more capabilities than the DGX.) So while you can create beats for the DGX, it won't be as simple as you'd like.
What's a multitrack sequencer and step sequencer for? I'm assuming those are the digital band jams built into the keyboard you can use to help lead you with chords and progressions?
I don't know what the Roland has, but the auto arrangement features of the DGX are not the same as the multi-track sequencer. Imagine you're writing a piece, and you want to have more than just a melody and an auto accompaniment. Looking at classical, imagine you want two separate musical lines like the
Bach Two Part Invention in C, but with different sounds for each of the parts. And also imagine that you can't play this yourself (yet). By using two tracks of the six track sequencer, you can have each of the two lines entered and stored separately, and then sent to a different sound. On the DGX, you've got six different tracks to record on, so you can build up a reasonable arrangement of something more than just auto-accompaniment. That's not the same as the digital band jams.
I know both have microphone jacks which is good for long term.
The microphone jacks on the DGX are only used to get your voice to the speakers or the external PA. If you're going to use an external PA, you may very well find an external mixer to be essential, so plugging your mike into the keyboard won't be all that useful. (I haven't figured out why they added a mike input; the DGX would normally be considered too heavy to be a gigging machine, with a sub-standard arranger implementation.)
I also have a grudge against built in speakers.
Depends on the usage. For a home, single keyboard setup for the average player, built in speakers is fine. (Assuming the speakers aren't crap.) This means that a person who wants to just sit down at the piano only needs to flip one switch and then watch the magic happen. I used to have a multi-keyboard setup in the front room, with a mixer and multiple sound modules in addition to the mixer. Power amp to some very nice speakers. To make the magic happen, I had to flip several switches, and then fix the mixer from when the dog sat on it looking out the window. This gets in the way of instant gratification.
On the other hand, when I want to do something other than play piano or some other quick and dirty sound, I go into the other room where I've got a keyboard that takes two minutes to turn on. (No kidding. There are
videos on YouTube.) Instant magic just ain't going to happen. So in that situation, where you're dealing with pro level multi-keyboards, a mixer and external sound generation may be essential. I've got both, and each serves it's purpose. (Actually, I'm seriously considering dropping the DGX now that I've got a "real" piano, another 88 key electronic keyboard that's more portable, and a fully functioned arranger. Or giving it to my daughter if she ever moves out. It's not that I don't like the DGX; it's a question of how many keyboards I really need. My wife is shocked I'd even consider it.)
As for my recommendation? When you buy this first keyboard, remember that it's going to be your first keyboard. It may be years before you're good enough to play it out. Almost any keyboard coupled with a computer will be adequate for years of work. If you want to ever play a piano, I'd get a weighted keyboard. Eighty eight keys are nice, but not essential, especially when you're starting out. On the other hand, five octaves is the minimum for a single keyboard.. If you love your family, get headphones.
For most people, given the option of learning keyboards (piano) on the DGX or the Roland, I'd recommend the DGX as an all in one solution. However, if you've already got amps, etc., and are used to all the rigamarole of electric instruments, that advice may not apply.
[Postscript] One thing that concerns me about anyone learning to play keyboards on instruments with lots of bells and whistles is that the actual keyboard playing may not get the attention it should. It's so much easier to just hold a chord in the left hand on an arranger than actually play with the left hand. So while the bells and whistles are great, don't rely on them when playing. Learn to play first, and then look for the short cuts. Learning to play on a piano, organ, harpsichord, clavichord, etc., means that you'll learn to play.