My G70's main battle piano still blows all these newer Roland's away.

And Ian.... most of the sonic difference between the older Roland's and the new ones comes down to the styles having been mixed and EQ'd better. If you take a BK-7m style, put it in the G70, then copy all the EQ settings to each individual drum sound in the kit, and the EQ's applied to the other Parts, you can get remarkably close.

The G70 was the first Roland to have individual 3 band semi-parametric EQ for each drum sound, and one for each Part, style or Keyboard. And this capability only came a couple of years or so into its life with an update. So, quite obviously, not only were the original G70's quite different sounding to the later ones, Roland themselves were not very familiar with the new capabilities, and it has taken them several years to really get used to the way styles should be mixed for best effect.

Thing is, those capabilities ARE in the G70, so all it takes is some editing.

There are a few kits in the BK7m I wish I had (they got introduced with the E80) but overall, with work, the G70 can still hang! Add to that an SRX-07 board, with wonderful fat basses, more guitars, tons of great keyboard and synth sounds, and much of the modern Roland's overall sound can be achieved.

You can even do a cabling workaround, to add an insert effect to any Style or Song Parts (which the G70 can't do OOTB), so putting better distortion on rock guitar rhythm parts, or a fancy panning tremolo on a Rhodes style part, etc., is very possible.

For all its age, there's a lot of life left in the old horse!