LH Rubbing

What is LH Rubbing?

LH Rubbing is a music and audio app for iPad built for creating and performing polyphonic synthesizer sounds. It focuses on an analog-style sound character and gives players direct touch control over modulation and expression while they play. The app includes three waveform oscillators, a separate noise source, multimode filtering, dual LFO modulation, and ADSR envelope control for shaping tones from simple leads to more complex textures. Its distinctive Keyboard Rubbing gesture adds vibrato and lets users vary the vibrato rate and depth through finger movement on the touchscreen. LH Rubbing is suited to musicians, synth enthusiasts, and iPad performers who want a compact software instrument for sound design, sketching ideas, or live experimentation. It was released by Liu Hao as an iOS software synthesizer.

Key features

• Play polyphonic synthesizer sounds on iPad
• Shape tones with three waveform oscillators and a separate noise source
• Use low-pass, high-pass, and band-pass filtering to sculpt timbre
• Modulate pitch, pulse width, filter, and mix settings with two LFOs
• Control vibrato expressively with the Keyboard Rubbing touch gesture
• Adjust pitch and filter behavior with ADSR envelope modulation

Safety overview

Status: Safe

LH Rubbing is a legitimate music app used for sound creation and performance. Its normal use centers on touch input and audio playback, and there is no clear sign of unusual background activity or system-level changes. As with most music apps, save any presets or creative work you want to keep before removing it from a device.

Recommendation: Keep LH Rubbing if you use it for iPad synthesis, sound design, or casual music experimentation. If you no longer use the instrument, you can remove it without affecting macOS, though you may lose saved presets or in-app work stored with the app.

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