# sinusedo — microtonal sinewave synth

> Microtonal sinewave synthesizer with dual keyboards and extensive modulation controls. (iPhone/iPad app by Alexey Nadzharov.)

- Source: https://appshunter.io/ios/app/sinusedo/id6444181090 (this page in markdown: same URL + `.md`)
- Developer: [Alexey Nadzharov](https://appshunter.io/developer/729549192)
- Category: Music
- Price: $3.99
- Rating: 4.71/5 from 7 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 11 MB
- Released: 2022-11-06
- Data updated: 2026-07-18
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/sinusedo/id6444181090/reviews.md

## What is sinusedo?

'sinusedo' is a sinewave synthesizer in standalone and AUv3 formats.

It features two independent keyboards with:
• 4 – 72 keys (voices, steps) per octave, each with its
own ring modulator
• maximum polyphony equal to the number of voices;
max polyphony is 144 voices
• 1 – 4 octave range, covering the frequency range of
about 8 – 4200 Hz
• display with note number (from C), note name,
frequency (in Hz), and deviation from 12-TET (in
cents)
• two sections per keyboard: upper for non-sustained
notes, gliding, and velocity; lower for sustained
notes and modulation rate
• mute button to stop/start all sound
• delete/panic button to erase all notes
• glide button for smooth sweeps across keyboard
frequency range
• modulation on/off button
• slider to set initial velocity and modulation levels
• slider to change velocity and modulation rates for all
notes on the keyboard proportionally and to show
current velocity and mod rate levels
• button to toggle keyboard visibility.

sinusedo supports MIDI input from external sources to
control each keyboard independently.

Supported devices: iPad, iPhone

## Key features

- Dual independent keyboards
- Microtonal tuning
- Ring modulator per voice
- Adjustable polyphony (up to 144 voices)
- MIDI input support
- Note deviation display (cents)
- Glide and velocity control

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/sinusedo/id6444181090/reviews.md

### 4/5 — Innovative concept, but limited options and too many bugs

*2022-11-07*

Suggestions for the dev:

Alex Nadzharov has created many creative apps that allow for n-tet (4 to 72-tet). Sinusedo is one of them, and it allows us to create some amazing multi-tet harmonies using both keyboards. However, the app is extremely buggy, and the options for control are limited.

I always like to write directly to the dev with questions, suggestions, and bug reports. However, Alex hasn't provided any method to contact him, so I'm reluctantly posting these comments with the hope that Alex will read them and consider fixing these serious bugs as well as adding these additional functions.

I will of course remove this review if the dev contacts me (I left a msg on his Facebook page for his rrarrow app), and I will give this app 5 stars if all these bugs are fixed and user options are added.

• A more in-depth manual and/or video tutorials would help

• An email address for support, suggestions, bug reports

• For the "keys" button, a double-tap would reset the number at 12 rather than having to punch up to 60 times to return it to this!

• We can slide our finger along the top of held notes for volume to create a pattern, or swipe under the note to create mixed oscillations. It would be nice to have a swipe on all the notes to turn off a range (or all) of the notes. (I know that if we change the number of keys, all the sound will stop for both keyboards, the the above method is more flexible.)

• It would be nice to have an option that when we close a keyboard the sound stops. In other words, perhaps two buttons:   

	– would close the keyboard and stop the sound playing; 

	–🎵would close the keyboard but keep the sound playing

• Turning on a sustained note always plays the note at full volume. It would be nice to have the option to start all notes at a very low volume so we can fade them up as needed.

• BUG: sometimes (often) when turning on notes, the rectangle doesn't appear, so you can't turn off the note. You have to click on a different note, then the rectangle appears.

• BUG: sometimes when touching the white portion of the notes and adjusting the volume, the note stays on, and often it's difficult to get the note turned off because it doesn't have the gray rectangle!

• BUG: when a note is sustained, then we tap the rectangle to turn it off, there is a bump in the volume before the sustain portion. This increased bump in volume is very noticeable.

• BUG: often when you have one or more sustained notes playing and add another one, it has no sound. If you drag the light gray mod rate bar down, you can then get the sound to trigger

• BUG: when you have a sustained note, then press the keys button (up or down, which turns off all sound and deletes all notes for both keyboards), then return the keys setting to what it was and press the same note you had before, pressing anywhere in the sustain area won't turn it on. However, other notes will turn on. 

The only way I've found to turn on the previously turned-on note is to first drag up/down in the upper (volume) area. This turns on a sustained note (which it shouldn't), then tap the 'off' rectangle. Now you can click the lower portion to turn on the note.

## Frequently asked questions about sinusedo

### What devices does sinusedo support?

sinusedo is available on iPad and iPhone, and also supports Mac. It is compatible with iOS and macOS operating systems.

### How many keys can each keyboard have in sinusedo?

Each keyboard in sinusedo can have between 4 and 72 keys (voices, steps) per octave. This allows for a high degree of customization in your musical arrangements.

### What is the maximum polyphony of sinusedo?

The maximum polyphony for sinusedo is equal to the number of voices configured, reaching up to 144 voices. This enables complex and layered soundscapes.

### Does sinusedo have ads?

No, sinusedo does not contain advertisements. As a paid application, it offers an uninterrupted user experience.

### What is the frequency range covered by sinusedo?

sinusedo covers a frequency range of approximately 8 to 4200 Hz. This range can be adjusted with the 1 to 4 octave range setting per keyboard.

### Can sinusedo be controlled by external MIDI devices?

Yes, sinusedo fully supports MIDI input from external sources. Each keyboard can be controlled independently via MIDI, offering flexible performance options.

### What is the age rating for sinusedo?

sinusedo has an age rating of 4+. This indicates it is suitable for users of all ages and does not contain mature content.

### When was sinusedo last updated?

The latest version of sinusedo, 1.2.0, was last updated on April 14, 2026. This indicates ongoing development and support for the application.

## Version history (last 5 releases)

### 1.2.0 — 2026-04-14

MAINTENANCE UPDATE

- minimum version is now iOS 15
- updated to latest JUCE framework version

### 1.1.4 — 2022-12-11

* fixed bug in sample rate handling

### 1.1.3 — 2022-12-09

v1.1.3

- correct octave & cents number display
- glide frequency display
- other fixes

### 1.1.2 — 2022-12-04

- fixed MIDI input in "omni" mode
- fixed note display and keyboard layout: the key name is now within -50ct..+50ct range instead of 0..+100ct in previous version

### 1.1.1 — 2022-11-25

version 1.1.1 adds note state saving: app will restore all sustained notes after the restart.
It also includes some bugfixes in keyboard UI and sound engine

changes since 1.1.0
— new controls opened with [ | ] button: 
  * slider that changes initial volume / modulation for all keys
  * slider that scales volume / modulation for all active sustained notes. It can be reset with double tap. Resets when all sustained notes are turned off.
  * mute active keys / turn off modulation for active keys
  * "glide" mode. can be toggled with double-tap or temporary enabled while you press and hold the key
  * [x] button switches off all held notes and received midi notes
  * values of the sliders in this left sidebar are reset when you hide it
— keyboard offset control added
- note number / frequency display box
— double-tap on keyboard controls to reset them to default value
— MIDI input working in two modes: directly mapped notes on sequential channels and 'omni' mode that receives notes and pitch bend values and adapts this to current keyboard settings. AUv3 plugin has MIDI input for its upper keyboard
- consistent key colors: currently the root key is A note (tuned as A4=440 Hz) and the keyboard scale is calculated from it 
— sample rate selection added
- improved audio engine performance
— fixed bug with keys that started silently until modulation was changed
— fixed bug with missing grey "note off" buttons
— fixed bugs with keyboard settings change with active notes

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## More apps by Alexey Nadzharov

- [Phawuo](https://appshunter.io/ios/app/phawuo/id729549189)
- [rrarrow](https://appshunter.io/ios/app/rrarrow/id814966319)
- [soundfruuze](https://appshunter.io/ios/app/soundfruuze/id1279045883)
- [lfoch](https://appshunter.io/ios/app/lfoch/id1665885755)
- [keyboaredo](https://appshunter.io/ios/app/keyboaredo/id6444124951)

All apps by Alexey Nadzharov: https://appshunter.io/developer/729549192

## Related topics

[sinusedo](https://appshunter.io/ios/topics/sinusedo)

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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 2026-07-18.*