# RX-79 — Breath synth for wind MIDI

> Breath synth for wind MIDI (iPhone/iPad app by sung ju KIM.)

- Source: https://appshunter.io/ios/app/rx-79/id6821795679 (this page in markdown: same URL + `.md`)
- Developer: [sung ju KIM](https://appshunter.io/developer/6781333993)
- Category: Music
- Price: $9.99 with in-app purchases
- Age rating: 4+
- Requires: iOS 15.0 · 25 MB
- Languages: German (Germany), American English, Chinese (Simplified, China), Korean, Japanese, Brazilian Portuguese
- Released: 2026-10-16
- Data updated: 2026-10-29

## What is RX?

Play the wind synth you know with a whole new set of sounds.
Warm woodwind tones for a soft ballad, bright synth leads for a bold solo.

RX-79 is a breath synthesizer that turns your wind controller and iPhone or iPad into a full sound module. Saxophonist SJsax shaped every sound and every response by actually playing it.

[Find the right sound for every song]
41 built-in sounds. 14 acoustic sounds including soprano, alto and baritone sax, clarinet, oboe, flute, trumpet, euphonium and harmonica, and 27 electric sounds including brass, leads and basses. Play the same melody in many different moods.
Tap the preview button in the sound list to hear a sound even without a controller.

[Fit it to your breath]
Adjust breath sensitivity, response curve, attack and decay, and set breath noise, tonguing and note-to-note connection to match your playing style.

[Make it your own]
Shape each sound with brightness, resonance, drive, vibrato, delay and reverb. Save the settings you like to the USER list and give them names. Saved sounds stay on this device.

[SJ PACK: 10 signature sounds, sold separately]
Extra sounds that carry SJsax's playing feel. Before buying, you can play each sound yourself for 30 seconds.
Note: SJ PACK is an in-app purchase sold separately from the app (one-time purchase).

[Connection]
Connect a USB MIDI wind controller. RX-79 responds to breath (CC2, CC11, aftertouch), pitch bend and vibrato (CC1).
Depending on the ports and power needs of your controller and iPhone or iPad, you may need a separate cable or adapter, such as a USB camera adapter.
Sound plays even with the silent switch on, and you can play along with backing tracks from other apps.
No internet connection required. No personal data is collected.

Connection and support
https://sjsax.com/rx79/

## Pricing and in-app purchases

Base price: $9.99.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| SJ PACK | $5.99 | one-time |


## Is RX safe?

Not enough ratings yet to assess RX.

## Is RX legit?

RX-79 appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for RX is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 2 releases)

### 1.0.1 — 2026-10-24

- New sounds including Sweet Bari, Sweet Harmonica and Trumpet 2 (41 built-in sounds)
- SJ PACK now has 10 sounds
- Jump between the Acoustic, Electric, SJ PACK and USER lists with the buttons at the bottom
- Saved sounds go to the USER list. Press and hold the display to rename one
- Open the list and tap PLAY to preview a sound
- Tap the left or right half of the OCTAVE pad to shift octaves, even while playing
- Plug in your controller and play right away, no app restart needed
- Quick start guide and 6 languages

### 1.0 — 2026-10-16

No release notes.

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## More apps by sung ju KIM

- [Band Session Note](https://appshunter.io/ios/app/band-session-note/id6781333991)
- [생각창고](https://appshunter.io/ios/app/id6793938580)
- [제주 GO JEJU GO](https://appshunter.io/ios/app/go-jeju-go/id6807737411)

All apps by sung ju KIM: https://appshunter.io/developer/6781333993

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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 2026-10-29.*