# LH Rubbing — virtual analog synthesizer

> Virtual analog polyphony synthesizer app for iPad with multiple oscillators and filters. (iPhone/iPad app by 昊 刘.)

- Source: https://appshunter.io/ios/app/lh-rubbing/id652348001 (this page in markdown: same URL + `.md`)
- Developer: [昊 刘](https://appshunter.io/developer/652348004)
- Category: Music
- Price: Free
- Rating: 4.20/5 from 19 App Store ratings · 13 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.3 · 12 MB
- Languages: American English
- Released: 2013-05-29
- Data updated: 2026-06-06
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/lh-rubbing/id652348001/reviews.md

## What is LH Rubbing?

LH Rubbing is a polyphony synthesizer app for iPad running on iOS 9.3 or later.
It sounds very analog.

There are three wave oscillators, one noise oscillator, two LFOs and one three type embedded filter (low-pass, hi-pass and bandpass).

Each wave oscillator can generate three kinds of waveform which are triangle, square and saw wave.

LFO can be attached to different modul for different modulation or control such as OSC Pitch, PW, Filter Cutoff Frequency, Filter Resonance and OSC Output Mixing.

The frequency and amplitude of the 1st LFO can be modified by the 2nd LFO.

Pitch, Filter Cutoff Frequency and Resonance can be controlled by the ADSR envelope generator.

The Keyboard Rubbing brings up vibrato while control the vibrato rate and depth.

## Key features

- Polyphony synthesizer
- Three wave oscillators
- One noise oscillator
- Two LFOs
- Three type embedded filter
- ADSR envelope generator
- Keyboard vibrato control

## Recent user reviews (10 of 13)

All indexed reviews: https://appshunter.io/ios/app/lh-rubbing/id652348001/reviews.md

### 5/5 — Love it!!

*2025-03-18*

But AUv3 please!

### 2/5 — Potential

*2024-08-22*

This synth could be of use in music making if it could be used inside AUM or Audiobus so that effects could be added and midi sequenced. Without that it’s all but useless to me!

### 5/5 — Most expressive!

*2022-01-08*

A fantastic addition to the studio. Very expressive playability and a modulation dream. Only request would be to add midi in/out and or audiobus compatability…

Thank you for this wonderful synth.

### 1/5 — ???????????????

*2021-12-09*

Works with NONE of the music apps I have.

### 4/5 — Quite nice really

*2019-01-21*

Many great features and the automation ball rocks. The rubbing part is like vibrato as you move up the piano key vertically, so ahead of the curve there. The is a hidden gem

### 5/5 — I like it

*2016-09-23*

Another important tool in my arsenal of sound creation.

### 5/5 — Nice!!

*2014-12-04*

Nothing but a little awesomness here.  Very playable synth with great sounds.

### 5/5 — Fat and original

*2014-09-16*

This is another one of my favorite synths that can cut thru or wobble or create wandering evolving textures. It has an awesome interface with a killer rubbing effect(a kind of automation). This one deserves your time and is stable.peace christo

### 4/5 — Surprisingly Lush

*2014-05-08*

This is actually quite a lovely synth.  I've managed to program a number of useful patches/some surprisingly unique sounds.  Definitely deserves more of my attention.

The responsiveness of knobs/buttons could use improvement.  Some are overly sensitive, while others take several touches/long-presses in order to make the necessary changes.  A value display while tweaking would be very beneficial, too.

### 4/5 — Keep it up!

*2013-06-18*

I get it... Long ago I owned a CAT by Octave and using this took me right back to those days in the damp basements working with a machine that had limits, but in many ways was more expressive than much of what is offered in the digital world today. This is a CLASSIC synth interface and can teach novices a few things about synthesis because it is exposed and simple. It also sounds pretty cool! Yes, it needs some work, (navigating patches is brutal) but my hope is that the developer is just getting started. 

Also, about the name... Try rubbing the keys... Heh. I am not sure if this is a method for controlling modulation I will embrace... But 50 points for originality! (I wondered why the thing that looked like it was in the place the mod wheel should be didn't do anything, heh). 

Pick it up and play with it... It's cheap, fun, and nostalgic.

## Frequently asked questions about LH Rubbing

### What devices does LH Rubbing support?

LH Rubbing is designed specifically for iPads running iOS 9.3 or later. It is not available on other Apple devices like iPhones or Macs.

### How frequently is LH Rubbing updated?

The app was last updated on October 4, 2021, with version 2.3. While not updated very recently, it remains functional for its intended purpose on compatible devices.

### What is the age rating for LH Rubbing?

LH Rubbing has an age rating of 4+. This indicates it is suitable for users of all ages, with no content restrictions.

### Does LH Rubbing have ads?

No, LH Rubbing does not contain advertisements. It offers an uninterrupted user experience for creating music.

### What kind of sound can I expect from LH Rubbing?

LH Rubbing aims to produce a very analog sound. It features multiple oscillators and filters designed to emulate classic analog synthesizer characteristics.

### Can I control pitch and other parameters with an envelope in LH Rubbing?

Yes, LH Rubbing includes an ADSR envelope generator that allows you to control Pitch, Filter Cutoff Frequency, and Resonance.

### What are the available waveforms in LH Rubbing?

Each wave oscillator in LH Rubbing can generate three types of waveforms: triangle, square, and saw wave.

### How does LH Rubbing compare to other iPad synthesizers?

LH Rubbing offers a focused virtual analog synthesis experience with its specific oscillator and filter configurations. Users often praise its authentic analog sound and intuitive controls for iPad.

## Version history (last 5 releases)

### 2.3 — 2021-10-04

sound engine polished

### 2.2 — 2021-08-17

fixed sound clip and extra noise

### v2.0 — 2018-01-25

This app has been updated by Apple to display the Apple Watch app icon.

Support for iOS 11
Changed the calculation of the amount of lfos for pitch control (twelve-tone equal temperament)

### 1.0.2 — 2014-02-15

New UI.
Support for iOS 7

### 1.0.0 — 2013-05-29

No release notes.

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## More apps by 昊 刘

- [LH Grain](https://appshunter.io/ios/app/lh-grain/id673676932)
- [LH XYZ](https://appshunter.io/ios/app/lh-xyz/id676800278)
- [LH Tuner](https://appshunter.io/ios/app/lh-tuner/id877746374)
- [Tuner And Metronome](https://appshunter.io/ios/app/tuner-and-metronome/id885575354)
- [XII AudioVisual](https://appshunter.io/ios/app/xii-audiovisual/id905741418)

All apps by 昊 刘: https://appshunter.io/developer/652348004

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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 2026-06-06.*