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@donman90 - I wouldn't call Marbles a sequencer. It creates "sequences" - but they are really just generative randomizations in a scale, with a set root key of C. Very difficult to customize the scale - definitely not live or in "real time". It is more closely related to the Buchla 266e Source of Uncertainty, and the modules derived from that (Verbos source of randomness, Frap Sapel, Make Noise Wogglebug). Easiest way to explain it's output: Take noise, quantize it to a scale of C major (as an example), and combine it with a clocked random gate. and you get 3 of those whose gates follow a pattern whose randomness can be locked in a loop 1 - 16 notes long.
IMHO - A sequencer typically denotes that you can construct a sequence - ie. [Step 1, E2, 1/4 note] [Step 2, G2, 1/4 note] [step 3, B2, 1/8 note]... and so on.
The best thing to do to get experience with marbles, is download VCV rack (free), read the manual from Mutable, and experiment. It is REALLY FUN! But, I found after using it for a few months, music generated by it started to just sound all the same - random loops of bleeps and bloops with no real construct or form. Plus... I could generate these patterns with VCV and output the CVs and Gates from my computer for free and save 18HP.
For a sequencer - I think one is better off with things like Rene2, Five12 Vector, Eloquencer, Circadian Rhythms, Verbos multistage, Stillson Hammer, Mimetic Digitalis, Hermod, ER-101, NerdSeq, Metropolis, or my favourites: Frap Tools USTA, and Intellijel Tete/Tetrapad.