As far as I know the engineering standards within Yamaha are excellent
and consistent. From what I've heard DX9 patches sound perfect from
DX7 but without velocity, and TX7, TX816 and other modules sound
identical. Also DX7 patches import perfectly into later Yamaha FM
products.
About variance; I'm talking about the design of emulators. There's
quite a lot of VSTs and other plugins (that all sound amazing) but the
same patch doesn't necessarily sound identical on each. Two classic
voices to test from the original ROM presets are Tuberise and
GrandPNO2.
BTW these are digital oscillators so temperatures and component
tolerances are not a factor.
About variance; I'm talking about the design of emulators. There's quite a lot of VSTs and other plugins (that all sound amazing) but the same patch doesn't necessarily sound identical on each. Two classic voices to test from the original ROM presets are Tuberise and GrandPNO2.
BTW these are digital oscillators so temperatures and component tolerances are not a factor.