The Moog oscillators are far more harsh, when listed to directly (e.g. in a modular system). I believe Synapse did something new with respect to the filter.
The Moog filter is notorious for thinning out the low-end at even low settings of resonance. My guess is that Synapse has added something to preserve the low-end from the oscillators as they come into the filter.
The mixer also colors the sound, but that is more like distortion based on the asymmetric nature of the mixer.
There is a certain smoothness to the demos, which probably means a delay or something like that at the end of the signal chain.
It sounds really good!
The product page does mention "a fixed filter bank that was modeled after Hans Zimmer's personal Vintage 914 Fixed Filter Bank". From the user guide: "FIXED FILTER BANK has 14 parallel filters: twelve bandpass filters with fixed middle frequencies, and two shelf filters: LOW PASS and HIGH PASS. Moving from the top left to the bottom right corner, the 12 bandpass filters range from 125 Hz at the FIXED FILTER BANK's lowestfrequency to 5.6 kHz at its highest. Each filter has its own designated attenuator control knob, allowing for each filter to be boosted or attenuated."
Product page also refers to an "expanded effects section" but doesn't go into detail. The user guide says, "The Legend HZ's reverb unit is particularly suited to the unique sonic challenges that arise whentrying to get a synthesizer to sit well within certain spaces. Synthetic sound sources like plainoscillators can be static and even boring when compared to an organic sound source like thehuman voice. Though the human voice can be easily recorded in a cathedral, the same can't besaid for a synthesizer, which needs some form of manipulation to achieve pleasing results.To counter this problem, The Legend HZ's reverb unit automatically applies modulation to thesignal to create a richer, more interesting timbre." The user guide for The Legend doesn't mention applying modulation to the reverb, so I'd assume that's new. There are also new reverb parameters.
The user guide implies that the delay is different too: "The Legend HZ contains a tape delay unit that recreates the effect of using analog recordingtape to create a series of echoes." Whereas the user guide for The Legend doesn't mention tape and has fewer parameters (for example, HZ has a "tape sat" parameter for tape saturation).
The Legend HZ also has a compressor, but The Legend apparently doesn't (since it's not mentioned in the manual).
"The Legend HZ makes use of a relatively straightforward, yet versatile, compressor unit withsimple controls ... Toggling the switch in the POLY position will allow thecompressor to work polyphonically. In this case, each individual voice will have its owncompressor. ... It can also be used in MONO mode, at which point it would be placed before the FX chain (insteadof at the end of it) ...
SLOW/FAST refers to the release time of the compressor.This switch was provided since The Legend HZ's COMPRESSOR unit doesn't have an attackor release setting. Toggling the switch in one position or the other will select between a slowrelease time or a fast release time (the time it takes for the signal to return to its initial state afterbeing compressed)"