Rack Chains

A rack is an ordered list of MIDI devices. MIDI enters at the start of the chain and exits at the end — like pedals on a floor or modules in a DAW chain.

Why chains matter

Each device transforms or routes MIDI:

• Filters pass or block by channel, note range, CC type
• Generative devices (Arp, Euclid, Seed, Step Seq) create new notes
• Pitch devices (Scaler, Transpose, Harmony) reshape pitch
• I/O devices connect to physical ports or clock

TIP

Order matters: a Channel Filter before an Arpeggiator behaves differently than after.

Building a chain

1. Main Menu → Racks → pick a rack.
2. Empty slots show + — open the device picker.
3. Press Select (short) Select a device to open its parameter list (Step Seq opens a step grid; Euclid opens a GRID of layer rows).
4. Hold Select (long press) Long-press Select on a device in the grid to open Options. Move Device (when the device can slide) then turn the encoder to reorder; Select drops it, Back cancels. Holding Select while moving still drops — it does not reopen Options. MIDI IN stays first. MIDI OUT stays last. The header Select square fills while you hold for Options.

Parameter editing

Device parameters use the same list UI as LFOs:

• Turn the encoder Encoder — move between rows, or change the value while sticky edit is latched
• Press Select (short) Select — latch sticky edit on a value (tap again to keep it); on/off rows still toggle
• Press Back (short) Back — while sticky, restore the value from when you entered and leave the list
• Hold Select (long press) Long-press Select — Options → Modulation (Assign LFO), Mapping (Internal / External mapping), or IN SNAPSHOT (keep this one parameter out of every snapshot — see Snapshots)

INFO

See Device reference for every device type.

Multiple racks

Each project holds up to 8 racks. Route different MIDI streams through different chains (see Router and Dispatch devices).

Rack snapshots

Hold Select (long press) Long-press Select on a rack in the list opens Rename, Duplicate, Clear, and Snapshots. Snapshots nests + TAKE A SNAPSHOT and the occupied slots for that rack only. Select an occupied slot to recall it. An empty rack cannot be stored.

See Rack snapshots.

Devices in a chain

Each rack chain can hold up to 10 devices total. When you open the device picker, types you cannot add right now appear dimmed — the rack may be full, or you already have the maximum of that type.

Duplicate on a device side menu follows the same rules as adding from the picker.

Per-type maximums (one rack)

Device type	Max in one rack
Total devices	10
MIDI Input / MIDI Output / Clock	1 each
Scaler / Transpose / M2CV	1 each
Euclid	3
Other types (default)	4 each

Category maximums

Device types in the same category share a cap when there is no per-type rule above:

Category	Max per type in one rack
I/O & Clock	1
Generative	4
Pitch & Harmony	4
Filters	8
Routing	4
Dynamics	4
Effects	4
Utility	4

Per-type rules (for example, only one Clock) override the category default.

If the S32 refuses to add or duplicate a device, see Troubleshooting.

Related topics

• Racks — Rack list and device grid
• Rack snapshots — Take and recall a rack bank
• Routing — Ports and virtual routing
• Mapping — Knob macros and external MIDI on parameters
• Modulation — LFO → device, LFO → LFO, LFO → macro