Studio Rack — Signal Flow

Permanent home setup · Behringer UMC1820 + RX1602 core

Audio Flow
Patch Bay
USB & MIDI
Optical
Rack

Audio Signal Flow

Guitar / Bass 1–2 3–4 5–6 7–8 PATCH BAY — In — Pairs 1–8 1–2 3–4 5–6 7–8 Valeton GP-5 UMC 1–4 1–2 3–4 iPad · UCA222 iPhone · UCA222 UMC 5–8 5–6 7–8 9–10 9–10 11–12 13–14 15–16 17–18 19–20 21–22 23–24 PATCH BAY 1 — Out — Pairs 9–24 9–10 11–12 13–14 15–16 17–18 19–20 21–22 23–24 normalled ↕ 9–10 11–12 13–14 15–16 17–18 19–20 21–22 23–24 PATCH BAY 1 — In — Pairs 9–24 9–10 11–12 13–14 15–16 17–18 19–20 21–22 23–24 Ch 1–2 Ch 3–4 Ch 5–6 Ch 7–8 Ch 9–10 Ch 11–12 13–14 (BT) Ch 15–16 RX1602 Mixer Behringer · 16ch Eurorack 1–2 PATCH BAY 2 Mixer Main Out → Pairs 1–2 Sony HMP-70
Roland TD3: MIDI out only to iMac — no audio path through rack.
iPhone FX loop: Mixer Mon Out → iPhone via PB1 7–8 → FX processing → wet return into Mixer Ch 15–16 via PB2 23–24.
BT Receiver: hard patched direct to Mixer Ch 13–14 — bypasses patch bays.
UMC 9–10 (line outs): PB2 21–22 — destination TBD (mixer Ch 13–14 occupied by BT hard-patch).

Patch Bay Map

Two Behringer PX3000 patch bays — 48 points TRS each (24 pairs). Rear A = source, Rear B = destination. Front provides normalled access or override point.

Patch Bay 1 — Behringer PX3000 (Pairs 1–24)

Pair
Rear A — Source
Rear B — Destination
Instrument Inputs — Pairs 1–8
1–2
— (front = Guitar / Bass In)
GP-5 In
3–4
Free source
UMC In 3–4
5–6
Patchable source
iPad UCA222 Inputs
7–8
Mixer Mon Out
iPhone UCA222 Inputs
Device Outputs → Mixer — Pairs 9–24
9–10
UMC Outs 1–2
Mixer Ch 1–2
11–12
GP-5 L/R Outs
Mixer Ch 3–4
13–14
iPad UCA222 Outs
Mixer Ch 5–6
15–16
UMC Outs 3–4
Mixer Ch 7–8
17–18
UMC Outs 5–6
Mixer Ch 9–10
19–20
UMC Outs 7–8
Mixer Ch 11–12
21–22
UMC Outs 9–10
— (Mixer Ch 13–14 occupied by BT hard-patch)
23–24
iPhone UCA222 Outs
Mixer Ch 15–16

Patch Bay 2 — Behringer PX3000 (Pairs 1–24)

Pair
Rear A — Source
Rear B — Destination
1–2
Mixer Main Outs
HMP-70 (Home Amp)
3–24
—
— (unassigned)
Bluetooth receiver (Eriskin) → Mixer Ch13–14 is hard patched direct, not via patch bay.
Mixer Ch13–16 not represented in patch bay — direct connections only.

USB & MIDI Flow

flowchart TD OxyPro[M-Audio Oxygen Pro 49] --> |USB| iMac TD3[Roland TD3] --> |MIDI out| iMac MIDIKbd[MIDI Keyboard] --> |USB| iPadHub[iPad USB Hub] iPadHub --> |Lightning + power| iPad iPadHub --> |USB-MIDI cable| UMC[UMC1820] UMC --> |USB| USBSwitch{USB Switch} USBSwitch --> |Position 1| iPadHub USBSwitch --> |Position 2| RJ45Hub[RJ45 Hub] RJ45Hub --> iMac iPhHub[iPhone Hub] --> |Lightning + power| iPhone iPhHub --> iPhUCA[iPhone UCA222] iPhHub --> XTM[X-Touch Mini] style OxyPro fill:#2a2a3a,stroke:#5a5a7a,color:#ccc style TD3 fill:#2a3a2a,stroke:#4a6a4a,color:#ccc style UMC fill:#1a2a3a,stroke:#3a5a7a,color:#ccc style USBSwitch fill:#3a3a1a,stroke:#6a6a2a,color:#ccc style iMac fill:#2a2a2a,stroke:#555,color:#ccc style iPad fill:#2a1a3a,stroke:#5a3a6a,color:#ccc style iPhone fill:#2a1a3a,stroke:#5a3a6a,color:#ccc style XTM fill:#2a2a1a,stroke:#5a5a2a,color:#ccc
DeviceConnectionRole
Oxygen Pro 49USB → iMac directMain MIDI keyboard controller
Roland TD3MIDI DIN out → iMacDrum triggers → MIDI
X-Touch MiniiPhone hub → iPhoneHands-on FX control for iPhone apps
M-Vave Chocolate PlusBluetooth → iPhone4-button control for Loopy Pro / iPhone FX
UMC1820USB → switch → iPad hub or iMacAudio interface, switchable host

Optical Flow

flowchart LR iPadUCA[iPad UCA222\nOptical Out] --> |TOSLINK| OS{3-way\nOptical Switch} iPhUCA[iPhone UCA222\nOptical Out] --> |TOSLINK| OS MBP[MacBook\nOptical Out] --> |TOSLINK| OS OS --> |S/PDIF out| UMC[UMC1820\nOptical In] style iPadUCA fill:#2a1a3a,stroke:#5a3a6a,color:#ccc style iPhUCA fill:#2a1a3a,stroke:#5a3a6a,color:#ccc style MBP fill:#2a2a2a,stroke:#555,color:#ccc style OS fill:#3a3a1a,stroke:#6a6a2a,color:#ccc style UMC fill:#1a2a3a,stroke:#3a5a7a,color:#ccc
Optical switch selects which device sends to the UMC1820 S/PDIF input — one at a time.
iPad can also connect directly to UMC via USB hub as an alternative to optical.
Switch PositionSourceUse case
In 1iPad UCA222Loopy Pro / iPad audio into UMC
In 2iPhone UCA222iPhone FX return into UMC
In 3MacBook opticalMacBook audio into permanent setup

Rack Contents — 6U Millenium Bag

1U Thon Drawer USB hubs · USB switch · X-Touch Mini storage
1U t.racks Power Strip 7 UK Power distribution
1U Behringer PX3000 Patch Bay 1 Core routing · Pairs 1–16
1U Behringer PX3000 Patch Bay 2 Aux routing · Pairs 17–24
1U Behringer RX1602 Mixer 16-channel Eurorack
1U Behringer UMC1820 Main audio interface · USB + optical
Valeton GP-5 and UCAs are stored in the rack bag but not rack-mounted — hard wired.
RP360XP retained but not in active use (replaced by GP-5).

Also in the room

ItemNotes
Roland TD3Drum brain · mesh pads + ddrum triggers in · MIDI out to iMac
M-Audio Oxygen Pro 49MIDI keyboard · USB to iMac
Sony HMP-70Record player · acts as amp for mixer main out
Sony Bravia TVDisplay for iMac
Reverend BuckshotGuitar
Yamaha BassModel unknown
Beyerdynamic DT100sHeadphones · monitoring via UMC headphone out
iMac 2011Primary DAW machine · Logic Pro, MainStage, Reaper · IK Multimedia plugins
iPad Air 2019Loopy Pro · standalone or synced
iPhoneFX loop via Mon Out · X-Touch Mini + M-Vave control

Separate portable setup

MacBook Pro 2016 runs as a standalone portable rig — Logic Pro, MainStage, Reaper. Optical out available for integration with permanent rack when present.