# Patch & I/O — Stage I/O List — Patchbay, diagram, stage plot

> Patchbay, diagram, stage plot (iPhone/iPad app by HYO SEOP LEE.)

- Source: https://appshunter.io/ios/app/patch-and-io-stage-io-list/id6809173652 (this page in markdown: same URL + `.md`)
- Developer: [HYO SEOP LEE](https://appshunter.io/developer/6790621758)
- Category: Music
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 18.0 · 6 MB
- Languages: American English, Japanese, Korean, Chinese (Simplified, China), European Spanish
- Released: 2026-09-12
- Data updated: 2026-09-14
- User reviews in markdown: https://appshunter.io/ios/app/patch-and-io-stage-io-list/id6809173652/reviews.md

## What is Patch & I/O?

Input list, patchbay and stage plot in one app. Type the sheet and the signal
flow diagram draws itself, and the app tells you when a mic that needs phantom
is sitting on an input that cannot supply it.

One show is one project. Fill in the channel sheet, lay out the patchbay,
draw the stage plot, and print the paper you hand the crew — all in one app.


■ I/O LIST

CH · SOURCE · PICK UP · STAND · REMARKS, the way the sheet looks on site.
Live and recording need different columns, so they are separate kinds —
recording shows PREAMP, INSERT and DAW TRACK as well.

Mics and stands are counted by model into their own list. No counting when
you pull gear from the store room.


■ WHAT IT CATCHES

- A source that needs 48V phantom on an input that cannot supply it
- Phantom reaching a ribbon mic or other gear it can damage
- A speaker-level output going into a line input
- The same channel number used on two rows
- Connector families that do not mate, so an adapter is needed


■ SIGNAL FLOW

The sources and mics you typed become the diagram. Identical models are
merged and counted (x4), and tapping one channel follows just that path.

Chains that do not fit a channel sheet — outputs and monitors, clock, power —
are drawn by hand. Drag block to block to connect them, or draw the line with
Apple Pencil.


■ PATCHBAY

24, 48 or 96 columns. Draw a segment and the jacks in that range get names
and numbers; normalling is set per segment too — full normal, half normal, thru.

Label strips print at actual size. That is the paper you cut and slide into
the bay window. Jack pitch differs by model, so you measure and enter it, and
the sheet carries a ruler mark to prove your printer did not scale the page.
If it is not 100 mm, print again.

Note: the default pitch (9.5 mm for a 48-point 1U bantam bay) is a reference
value. Measure your own bay before printing.


■ STAGE PLOT

Place, rotate and resize drums, amps, wedges and stands. Put things on risers,
and attach channel numbers from the I/O list to any symbol. Draw the venue's
standard layout once, then copy it for each show.

You can mark it up with Apple Pencil (view-only on Mac).


■ ON PAPER

I/O list, patchbay sheet, label strip, signal flow, stage plot — all export as
PDF. Long channel counts split across pages, and when the inputs overflow they
flow into two columns so you use less paper.


■ LEARN (ALL FREE)

Photographs and pin tables for nine connectors: XLR, TRS, TS, bantam, RCA,
Speakon and DB25. Cable wiring diagrams, and a practice mode where you connect
the pins at each end yourself.

The things that catch people out on site are written down — such as how to
handle pin 3 (cold) in an insert Y-cable.


■ WHAT THE FREE VERSION DOES

- Build and view every screen. No limit on channel count
- Two each of: live projects, recording projects, patchbays, diagrams, stage plots
- PDF export works (with a watermark)
- All of Learn
- iCloud sync is free too. Change devices and everything is still there

The lifetime unlock removes the document limits and the watermark, and adds
CSV import/export and actual-size label strip printing.

It is not a subscription. Buy once, and it opens on your iPhone, iPad and Mac
under the same Apple Account.


■ FROM THE MAKER

Built to use on the job. If something is missing or wrong, tell me.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Lifetime Unlock | $11.99 | one-time |



## Version history (last 1 release)

### 1.0 — 2026-09-12

No release notes.

## Apps similar to Patch & I/O

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| --- | --- | --- | --- |
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## More apps by HYO SEOP LEE

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- [DAW Shortcuts — KeyMap](https://appshunter.io/ios/app/daw-shortcuts-keymap/id6806570824)

All apps by HYO SEOP LEE: https://appshunter.io/developer/6790621758

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-14.*