# Assemble — Synthesiser & Sequencer

> Mobile music creation tool with synthesizer, sequencer, and audio/video recording. (iPhone/iPad app by David Spry.)

- Source: https://appshunter.io/ios/app/assemble/id1523248397 (this page in markdown: same URL + `.md`)
- Developer: [David Spry](https://appshunter.io/developer/1523248399)
- Category: Music
- Price: Free with in-app purchases
- Rating: 4.40/5 from 18 App Store ratings · 3 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.4 · 3 MB
- Languages: American English
- Released: 2020-08-12
- Data updated: 2026-06-10
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/assemble/id1523248397/reviews.md

## What is Assemble?

Assemble's synthesiser features four bandlimited oscillators, each with eight voices of polyphony, a 16x oversampled tempo-synchronised stereo delay effect, and a vibrato effect. The parameters of each oscillator and each audio effect can be modified easily in real-time.

The synthesiser can be played by sequencing patterns of notes with Assemble's sequencer. Notes can be sequenced using a computer keyboard and mouse, or alternatively using Assemble's on-screen keyboard. A sequence can include as many as eight sixteen-step patterns, which can be played discretely in Pattern Mode or sequentially in Song Mode. Once a sequence is complete, it can be named and saved locally on your device.

Assemble can record audio and generate video clips from recorded audio for sharing. Each video clip adapts to Assemble's visual theme and features one of two audio visualisations: a standard waveform plot, or a Lissajous figure.

## Key features

- Four bandlimited oscillators
- 16x oversampled stereo delay
- Tempo-synchronised effects
- 16-step sequencer with 8 patterns
- On-screen keyboard and computer input
- Audio recording
- Video clip generation with visualizers

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Assemble Unlocked | $4.99 | one-time |


## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/assemble/id1523248397/reviews.md

### 3/5 — Needs auv3 or audiobus

*2021-10-20, version 1.1*

Like what I’m hearing but n0w way t0 use elsewhere seems to be stand alone only.

### 5/5 — Brilliant and unique musical app

*2020-08-30*

Brilliant app, with a really smart design making this probably one of the best experimental tools I’ve found. Highly recommend.

### 1/5 — Beware of the white noise bug! Feels like work in progress at best.

*2020-08-20, version 1.0*

!!!! Very important! This app has a bug which makes the app make a white noise for about 10 seconds at full volume completely randomly! This can potentially ruin your sound system and even your hearing! This happens consistently on an iPad 2019 running iOS 13.6. 

I was really hoping that using it with a USB keyboard would make it faster to use but very little is gained by connecting it. Putting steps into the sequencer is at a level of some office machines from the 80’s, with arrow presses and necessity to look at the screen, not by feel, as you navigate through the grid. 

The synth parameters page has to be operated by touch, not by keyboard so why bother using keyboard anyway? This page is separate and one has to navigate away from the main interface view to change parameters. This is done by pressing and sliding the values. Not very responsive and easy to do. 

Sequencer grid is small and individual steps crammed (using it on iPad 2019), lots of space around it which feels like a waste. 

No vertical mode.

The keyboard for putting notes is very small. 

Toggling between dark and bright mode (moon and sun icon) has an incredible amount of latency of almost 3 seconds!

***In response to the the developer’s reply: If the white noise is there on purpose, this makes want to give the app even less than a one star rating. There’s no warning of the noise. Do you don’t realize it can ruin a sound system or hearing?

**Developer response:** I'm sorry to see that you dislike Assemble, Matreve.

White noise is periodically mixed in with the audio output while the app is not 'unlocked', and Assemble's IAP product consists in disabling the white noise. This serves to allow users to try the app and its key features before deciding whether to purchase it or not. Happily, it will not damage your speakers or your hearing.

Since the time of your review, the redraw time required to alternate between the two visual themes has been shortened considerably. This improvement will feature in upcoming versions of Assemble and Assemble Light.

If you have any further suggestions, then feel free to send them to me via my website: http://www.davidspry.io/

## Frequently asked questions about Assemble

### What devices does Assemble support?

Assemble is currently supported on iPad devices. It was released on August 12, 2020, and its latest version is 1.2, updated on January 20, 2022.

### How does Assemble's sequencer work?

Assemble's sequencer allows you to create musical patterns with up to eight 16-step patterns. These can be played individually or sequentially in Song Mode. You can input notes using a computer keyboard, mouse, or the on-screen keyboard.

### Can I save my music projects on Assemble?

Yes, once a sequence is complete, you can name and save it locally on your device. This allows you to revisit and continue working on your musical creations.

### What kind of audio effects are available in Assemble?

Assemble features a 16x oversampled tempo-synchronised stereo delay effect and a vibrato effect. The parameters for each oscillator and audio effect can be easily modified in real-time.

### Does Assemble have ads?

No, Assemble does not contain advertisements. It is a free application with optional in-app purchases.

### What are the audio visualisations in Assemble?

Assemble can generate video clips from recorded audio featuring one of two audio visualisations: a standard waveform plot or a Lissajous figure. These visuals adapt to the app's theme.

### What is the age rating for Assemble?

Assemble has an age rating of 4+, making it suitable for a wide range of users. The app focuses on music creation and does not contain mature content.

### How often is Assemble updated?

The latest version of Assemble, 1.2, was released on January 20, 2022. While specific update frequency isn't detailed, this indicates ongoing development and support for the application.

## Version history (last 4 releases)

### 1.2 — 2022-01-20

+ Oscillators can be muted by double-tapping the oscillator labels on either the main screen or the parameters screen.
+ Implemented UI and performance improvements.

### 1.1 — 2020-12-06

+ Redress a bug that prevented iOS 14 devices from saving and loading sequences.

### 1.0.1 — 2020-09-01

+ The time required to redraw the sequencer when alternating between Assemble's visual themes has been reduced considerably.
+ Assemble is no longer silent when the device it's running on is in silent mode.

### 1.0 — 2020-08-12

No release notes.

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## More apps by David Spry

- [Assemble Light](https://appshunter.io/ios/app/assemble-light/id1525742798)

All apps by David Spry: https://appshunter.io/developer/1523248399

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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.*