While the boomy and annoying bass post WAS from before the OS2 fixes, Donny's G70 undoubtedly had the latest OS and styles in it........

My first advice to ANYONE listening to a G70 through a system that has a sub-woofer (even little Logitech home units) is...... TURN OFF THE MASTERING TOOLS!

Listen to the G70 without the hype of additional EQ and Multi-Band Compression (which is really a level-dependent EQ if used the way Roland have it programmed). On smaller speakers, without a sub, or through a small-ish mono keyboard amp (what you'll often find them connected to in a store) the Mastering tools go a long way to making the G70 sound 'fuller'.

But hook it up to a decent set of speakers with a sub (especially as few people set up their sub quiet enough - it's supposed to add just a bit more depth to the bass, not shake your bowels loose!) and all that hype just succeeds in exaggerating the low end to the point of boominess.

As with ANY EQ and compression, FIRST get the sound as right as you can without it, and then just add a little to bed it all together. Go to any audio mastering forum, and read the many posts from experienced audio professionals about how dangerous a multi-band compressor can be in the wrong hands. They are a double-edged sword, with the sharp side towards you!

Just remember..... the Mastering Tools setting that makes one style sound full and punchy will probably be the wrong one for a different style, and unfortunately, these setting are global, NOT linked to the style....... Far better to work on the style itself with the Tools off, and then just use the Tools for room adjustment if you play in several different venues. (And I sure wish the G70 allowed you more than ONE user setting for each!)
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An arranger is just a tool. What matters is what you build with it..!