modeled..
https://www.roland.com/us/products/rc_d ... ollection/
Backed by our Analog Circuit Behavior (ACB) technology, these iconic instruments are brought to life with breathtaking realism in your DAW—and all for one low price.
Analog Circuit Behavior (ACB).
Thanks to our proprietary circuit modeling technology, these classics are ready to imbue your tracks with retro energy and fuel tomorrow’s masterpieces. The ACB process involves carefully analyzing original hardware units, circuit diagrams, and other historical data. We then use this information to recreate the authentic circuit behaviors of the vintage instruments—including all their beloved quirks and instabilities—giving these rhythm machines their amazingly lifelike sound and organic response.
I seem to recall that on the original 909 the crash, ride and hihats were samples.
https://www.soundonsound.com/people/his ... and-part-2
rsp
