Sounds like: Slow, overlapping notes cascading up and down in a huge reverb wash.
A slow, wide-ranging arpeggio with long, overlapping note gates and heavy reverb — rather than a rhythmic pattern, the arpeggiator here generates a constantly shifting, cascading pad texture from a single held chord.
Open this patch in the interactive PatchpadHold a wide 4-note chord. MODE CYCL plays it ascending then descending for constant directional movement, RANGE 3 spreads it across three octaves, and N.LEN pushed long makes consecutive arpeggiated notes overlap into each other rather than sitting as separate discrete hits — that overlap plus FX page's REV/DEL is what turns a mechanical arpeggio into a continuous cascading wash. ALGO 1 routes operator A (and B) into carrier C, so LEV (A) and LEV (B) are set to 0 on SYN page 2 and MIX is -64 (the X output, C only): that leaves C a plain, unmodulated carrier.
Same SY CHIP note-cycling substitute as a rhythmic arp patch would use, but slowed down (SPD 1/8) with a wider OF2-4 spread (octave, octave+fifth, two octaves) for a cascading rather than percussive feel.
Gate at 120 (near the 127 max) keeps consecutive arpeggiated notes essentially legato, so they blend together rather than sounding like separate rhythmic hits; Octaves 4 spreads the cascade wide (Summit's real range is 1-6). Large-size Reverb plus Chorus for width turn the whole pattern into a wash. Live control: ride the panel Arp Octave knob for the cascade width and the Reverb Level knob for the wash.
Osc 1 is BasicWaves with Morph at 50 (pure sawtooth): the Morph knob runs from a square (0) through a sawtooth (50) to a double sawtooth an octave up (100), Sym only changes the pulse width below 50, and Sub adds a sine an octave down (0 here). Octave Range at its max of 4 and Gate near its max of 99% give the widest, most overlapping cascade this hardware allows. FX1 Reverb and FX2 Delay — two of MiniFreak's three real effects slots used together — turn the arpeggio into a continuous wash rather than a series of distinct notes. Values are on MiniFreak's native 0-100 scale.
Typhon has no arpeggiator, but it has a real note sequencer (SQNCR button: 1 to 32 steps over a 6-octave range, with per-step octave, note, gate, velocity, plus probability, division and swing). Program the pattern's notes directly instead of holding a chord. Steps 1-2 C (OCV +1), 3-4 C (OCV +2), 5-6 G (OCV +2), 7-8 C (OCV +3): a wide rising cascade, with GATE near maximum so notes tie into one another. The Filter and Amp ADSR and the front-panel settings shape each note.
Mode Up/Dn with Octave Mode UpDn and Range 4 cascades a held chord up and back down across four octaves. Gate near 100% keeps notes essentially legato. The dedicated Reverb module's Cloud type (long, granular-feeling decay) does the wash work, separate from the arpeggiator itself.
The same real/approximated arpeggiator split as the rhythmic version of this idea (Arpeggiated Octave Bass) applies here — Digitone II, Novation Summit, Arturia MiniFreak, and ASM Hydrasynth Desktop use their real arpeggiators pushed to wide octave range and near-legato gate; Syntakt substitutes SY CHIP's note-cycling; Dreadbox Typhon substitutes a hand-programmed M1 StepSequencer. What differs from the bass version is the emphasis on onboard reverb/delay on every synth — the cascading wash character depends as much on the effects as on the arpeggiator settings themselves.