At that stage they are unix system programming using c pdf put into machines ROM.
In parallel to D-70, Roland put out MV-30 which is very similar engine with added MC-50 sequencer.
It should be said that XV series have a destructive form of compression similar to mp3 and it can be spotted visually with most simple analyzer.
Outro This is a FAQ for all of the Roland JD, JV, XP and XV series.
There is no such compression on JD series.This is most obvious on layered sounds that have a lot of phasing between oscillators going.XP-30 (1999) XP-60 with added patches (waveforms) from three expansion boards (session, orchestral, techno removed sequencer.From this, Nyquist on JV-1080 is at 16 kHz.And as you can see there are no such holes in JD-990 which makes it clear that JD-990 does not use destructive form of waveform compression.Their equivalent on Super JV and XV is as following: JV-80 Soft setting, resonance set to max XV-5080 reso set.New sound sets for the JD-Xi, new sound sets for the JD-XA, new sound sets for the JD-Xi, new sound sets for the JD-XA, new sound sets for the juno-DS61/juno-DS88, new sound sets for the FA-06/08, new sound sets for the FA-06/08.
By observing same waveforms on JD-990 which does not use this form of compression and comparing it to the later JV series, it is easy to conclude that.
XP-50 (1995) JV-1080 with keyboard, sequencer, floppy JV-2080 (1997) JV-1080 big LCD (better user interface 3 EFX, 8 x expansion slots.
Super JV has a filter from JD series. .
There has been a lot of talk about difference in sound within units that should be based on the same engine.(though some web pages list it as 32kHz ROM only, but this is not true).There are a lot of such waveforms in Super JV and XV series that have holes in them.You can set it to 0dB or even -6dB.What we can clearly see is that not only they are identical but they both go all the way up to 22kHz, which clearly indicates.1k playback.Patches played on 10ide by side will sound different.WinJV/WinXP Sound editor by Marco Stella - used to be m/mstella/ SuperJV Sound editor by DeIoris (Italy) - web site no more the ghost of flight 401 pdf exists?Benefits of XV over JD is that the filter on XV has a greater dynamic range.Some final words on the JV-80 vs JV-1080 They sound different due to 1) different digital filters 2) different anti alias filters.