# sqsl Latch — Conceptual MIDI controller

> Conceptual MIDI controller and sequencer for soundscape synthesis. (iPhone/iPad app by Michal Macura.)

- Source: https://appshunter.io/ios/app/sqsl-latch/id1659829499 (this page in markdown: same URL + `.md`)
- Developer: [Michal Macura](https://appshunter.io/developer/1648278061)
- Category: Music
- Price: $19.99
- Rating: 3.67/5 from 3 App Store ratings · 6 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.5 · 4 MB
- Languages: English
- Released: 2022-12-17
- Data updated: 2026-06-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/sqsl-latch/id1659829499/reviews.md

## What is sqsl Latch?

sqsl Latch is a conceptual MIDI controller and sequencer designed for working with evolving drone, textural or soundscape synthesizer patches. It can send out MIDI notes, pitch bend and CC values. 

There are 16 groups split into 2 banks (a, b, c, … p). Groups have assignable MIDI channel, color and 8 Continuous Controllers (CC). 

When user touches one of the pads, note is activated and is held on until new touch (on the same pad) is registered. Left slider controls the velocity of note to be activated.

Every group has a looper able to record note state changes - phrases. Order and velocity of recorded notes is automatically shuffled after phrase restarts (can be optionally prevented by activating group’s LOCK button). 

Phrase playback speed is adjustable (CLOCK and DIVIDER parameters). Phrase can be synchronised - set to restart automatically with previous group's loop. Synchronisation can be set to happen on every pass, every second, third... up to 16th and can be set to be ignored randomly (probability setting 0-100%).

Group parameters can be adjusted using sliders or modulated by internal randomiser with adjustable range (RANGE and RANGE 2 parameters) and speed (per group LAG control - left-most slider).

Apart user definable CCs, each group has following MIDI parameters: MOD (mod wheel), BEND (pitch bend), VOL (volume), EXP (expression), PAN (pan), FOOT (foot controller), TOUCH (aftertouch/channel pressure). 

Group parameters related to phrase playback are: CLOCK (resolution and playback speed), SYNC with divider (loop synchronization), NOTE SKIP (randomly skipping notes events 0-100%), SYNC SKIP (randomly skipping sync events 0-100%), DIVIDE (integer group's CLOCK divider), LOOP (loop or one-shot setting), SHIFT (degree offset with selected scale).

LAG can be applied to parameter changes - when new value is selected, change does not happen immediately but value is transitioned smoothly based on LAG time (left-most slider).

Setup setting (CC numbers, channels, colors, and MIDI output) are saved and recalled when app is restarted. Loops, CC values, parameters and their modulation states can be written to preset positions for later recall.

For detailed description visit https://www.seqsual.com/latch

Important notes:
- Latch does not make any sounds on its own, it generates MIDI messages (notes, pitchbend and CC values).
- Latch does not synchronise to incoming external MIDI clock.
- Latch was designed for full-size iPads and is not recommended for iPad Mini users.

## Key features

- MIDI note, pitch bend, and CC output
- 16 groups with assignable MIDI channel and color
- 8 assignable Continuous Controllers per group
- Looper for recording and shuffling note phrases
- Adjustable phrase playback speed and synchronization
- Parameter modulation via internal randomizer
- Smooth parameter transitions with LAG control

## Recent user reviews (6 of 6)

All indexed reviews: https://appshunter.io/ios/app/sqsl-latch/id1659829499/reviews.md

### 1/5 — Does not support running in the background

*2025-01-03*

What could have been an amazing app at its price point. Turned out to be terrible but beautifully useless way to spend 20 bucks. The app stops sending midi messages when I switch to my synth. There is also 0 documentation. If the app would be 4 dollars, I would have given it more favorable rating but at this price point 1 start is to positive, will be asking for the refund!

**Developer response:** Hi, sorry to hear about your issue - it is supposed to be working in the background. I will be check this week if recent iOS updates broke that functionality/fixing it. You can reach me using contact form on www.seqsual.com/contact.

### 2/5 — Shame

*2024-03-25, version 1.2*

Such a shame this app doesn’t work in the background, thought this had been fixed, makes it next to useless for iPad only users

### 5/5 — Fabuleux

*2023-01-07*

Bien que l’interface soit un peu déroutante, une fois apprivoisée, les possibilités s’avèrent immenses et le résultat largement à la hauteurs d’un prix qui pourrait sembler de prime abord un peu élevé. 
Idéal pour produire des mélodies hypnotiques, drones, musiques d’ambiance, en ce qui me concerne je trouve "sqsl LATCH" absolument fantastique 👍

### 5/5 — Five stars for the concept, but why no save / restore ?

*2023-01-03, version 1.01*

This app is great for ambient and drones. I love playing with it. However I do miss some functionality that I would expect from an app in that price range:
First and most important: Saving and restoring settings including the motion sequences and recorded notes.
An AUv3 version - inter app audio is an outdated system.
And I go with Gav that a drop down for the scales would be easier than the hit and guess matrix.
Otherwise happy new year and keep up with your good work.

### 5/5 — Amazing for ambient sounds

*2022-12-30*

Perfect for working texture and character into pads etc. lovely app. AUV3 would be a dream - and I hope it’s on the roadmap !

### 5/5 — Conceptual synth?

*2022-12-27, version 1.0*

Gavinski says it's good...he did an awesome tutorial on this app. So on that basis I'll buy it. Creating ambient tectonic landscapes of sound with one app? It costs less than one cocktail in a London bar? Yeah, let's do it!

## Frequently asked questions about sqsl Latch

### What is sqsl Latch used for?

sqsl Latch is a conceptual MIDI controller and sequencer. It's designed for creating drone, textural, or soundscape synthesizer patches by sending MIDI notes, pitch bend, and CC values.

### Does sqsl Latch make sounds?

No, sqsl Latch does not produce any sound on its own. It generates MIDI messages that are then sent to external synthesizers or software instruments to create sound.

### What devices does sqsl Latch support?

sqsl Latch was designed for full-size iPads and is not recommended for iPad Mini users. It is not available on other devices like iPhones or Android tablets.

### How much does sqsl Latch cost?

sqsl Latch is a paid application, priced at $19.99. There are no in-app purchases or subscription options available for this app.

### How often is sqsl Latch updated?

sqsl Latch was last updated on April 4, 2024, with version 1.21. The release date was December 17, 2022, indicating relatively frequent updates since its launch.

### Can sqsl Latch sync with external MIDI clock?

sqsl Latch does not synchronize to incoming external MIDI clock. However, its phrase playback can be synchronized with previous groups' loops using adjustable divider settings.

### What is the user sentiment for sqsl Latch?

Based on the available data, sqsl Latch has a rating of 3.0 stars from 2 ratings. This suggests a mixed to neutral user reception at this time.

### Does sqsl Latch have ads?

No, sqsl Latch does not contain advertisements. As a paid application, it offers an ad-free experience for its users.

## Version history (last 4 releases)

### 1.21 — 2024-04-04

- Fixed issue that prevented background processing on recent iOS versions.

### 1.2 — 2023-05-26

- custom scales (7 positions)
- recorded phrases are quantised to currently selected scale
- sync for phrases (with divider parameter) and random sync skip control (0-100%)
- random note skip parameter (0-100%)
- integer clock divider (affecting phrase timing and notes durations)
- loop/one shot behaviour of recorded phrases (when synced, one shot phrase is restarted with its master)
- degree shift of phrases (within currently selected scale) 
- separate modulation range for MIDI parameters group (RNG I) and phrase parameters group (RNG II)
- copy/paste function for recorded phrase
- option to turn note latching off
- manual rescan of available MIDI destinations
- pressure (aftertouch) parameter
- slightly reorganised interface to accommodate controls for new functionality
- bug fixes.

### 1.01 — 2022-12-27

- Added background processing
- Bug fixes

### 1.0 — 2022-12-17

No release notes.

## More apps by Michal Macura

- [sqsl Temp](https://appshunter.io/ios/app/sqsl-temp/id6443673379)
- [Addressing](https://appshunter.io/ios/app/addressing/id6449605991)
- [sqsl Nashville](https://appshunter.io/ios/app/sqsl-nashville/id6752020560)
- [sqsl Mantra](https://appshunter.io/ios/app/sqsl-mantra/id6755682124)

All apps by Michal Macura: https://appshunter.io/developer/1648278061

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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 2026-06-10.*