Wow... yet again, Roland misses the mark quite a bit. (imho)
This module could've been a nice expander to the "OG" JD-800, like a voice expansion of 128 voices, and neat to bring to live gigs, if it could work as a stand-in... and IF it could be programmed externally from the JD-800, receive patch dumps by sysex etc. But as it doesn't receive sysex commands, well... I wouldn't even bother to program it with those tiny sliders.
128 voices polyphony... well, that's great, but... for what? 2 parts multitimbrality?
Had it been 5+1 parts, like the OG, 128 voices would've been a big +, but 5-6 parts sharing 24 voices is worth more than a 2-part 128 voice imo, at least when it comes to the JD. On the OG, you can also para-EQ each part separately, which makes it super versatile.
The aftertouch control sliders have been OMITTED!
No aftertouch vibrato, or VCA and VCF expressions... AND on top of that, as some already know, the Cutoff slider even on the OG is EXTREMELY steppy, as it covers pretty much the audible spectrum on 100 steps... even 1 step is quite audible, especially with resonance up... and JD-08 sliders are like 1/5th the size of the OG... THE WORKAROUND for the filter stepping of the OG, was to use an Exp-Pedal set to AT in the menu, or a potentiometer to the Exp-Pedal jack, or using an external MIDI controller to send it aftertouch. That way you could scale defined modulation-ranges of filter/amp/lfo-pitch each separately to the AT, and control it with a knob, slider or pedal (or key-AT of course). Making for SMOOTH manual filter finetuning and sweeps live, getting rid of that horrible stepping...
The worst part of it (without the workaround) was when having changed patch, and you want to tweak the Cutoff a little bit from, let's say, 20 to 22, but the slider is currently at 98... so you grab it and: !F*j!!QkS*FSKAAAAOOOOOUUUUWW!
Nice...
I don't know what else they messed up, but I see no need to dive any deeper... Goodbye Roland!
And oh yeah, one of THE biggest pros of the OG JD-800 imo, is the UI, that's where the magic is... a major part to its popularity I'm sure. So, JD-08...