i have here all three, the 100m basic 5 module system, the original System100 (the 101 keyboard) and the SH2.
first, to make a broad aproximation, sys100m and SH2 are much closer to one another sonically than sys100(101). their sound is more agressive, focused. sys100 sounds big, in a way typically described as "70s", "discrete", "organic" etc. take your pick. its a single oscillator, yet its so rich and powerful, that when playing a bass drone notes (i used it live on a big PA) it reminded me of similar single osc deep notes from taurusI, or moog modular from tomita albums or even carpenter scores.
filter is a variant on moog's transistor ladder design, but doesnt use transistors but diodes iirc. sometimes it behaves very similar, sometimes not.. it has a quality of its own. silkiness/liquid resonance, that has a beautiful self oscillating tone. minimoogs is more a brute comparably.
overall this synth has something in its highs/harmonics, some kind of fine silky saturation, regardless if you play a bass or hi note, that makes its portamento (or trancey if you prefer) leads the sweetest i ever heard. the high end is to die for. i find it livelier than my minimoog in that peticular area.
to describe the difference between 100m and SH2, i always have a problem putting these differences in character in words. so don't take the following literaly, more like my personal interpretation:
both sound unmistakeably late 70s "roland" to me. focused, not lively like early arp/moog/etc. oscillators on both machines have similar sound. SH2 is kinda saturated comparably, whether this comes from vco to vcf gain stage, or on the vca itself i dunno. but its one thick mother. almost compressed. resonance is drier on SH2, tad more liquid on 100m. equally fast, but i slightly prefer the envelope punch on SH2.
so, i would say, for some ppl a 100m will leave an impression of a "modular" SH2, with additional flexibility, two filters, two envelopes, but no (powerful) sub oscillator. for some other, there will be subtle nuances that make them different. ymmv.
love the S/H with lag on 100m.. route this to filter and.. its heaven..
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