Expressive Piano Synthesizer

Joel K C

Contains adsIn-app purchases

About this app

Expressive Piano Synthesizer is a virtual instrument focused on fluid, continuous control and MPE-ready performance. Play microtonal scales, slide between notes on a piano-style surface, and shape nuanced articulations that feel natural for strings, winds, basses, and leads.

Highlights

Fluid multidimensional sliding keyboard (continuous pitch & pressure)

Microtuning: play Arabic/Indian classical scales and custom temperaments

Auto pitch rounding per note for clean intonation with expressive slides

MIDI 1.0 + MPE: send/receive via USB OTG or BLE (where supported)

Sound engine: analog-style oscillators (with sub + noise), sync, wave-folder, saturator, bit-crusher

Modulation: 2 LFOs (tempo-sync, retrigger), 2 general-purpose envelopes

Filters: ladder low-pass, band-pass, high-pass (each with dedicated envelopes)

FX: chorus, delay, and a lush reverb with presets

Presets: 40+ ready-to-play pads, basses, leads—fully editable

Record & arrange: works with desktop/mobile DAWs via standard MIDI routing

Design philosophy
The layout is familiar like a piano, but the surface is continuous so you can slide, vibrato, and add per-note expression without learning a new instrument technique.

Connectivity
Use standard MIDI to control software instruments, hardware synths, arrangers, and sequencers. Record your performances in your DAW, automate parameters, and capture microtonal ideas with per-note expression.

Roadmap

Built-in recorder

More factory presets

Cloud preset backup

Direct surface scrolling

We love feedback—tell us what you create with Expressive Piano Synthesizer!

Disclaimer
All product names and standards mentioned are used for identification of compatibility only; no affiliation or endorsement is implied.

Ratings and reviews

Bought the pro version. OK, but 2 issues: 1. Sometimes it will start playing a note continously. This might be a feature that I somehow activated, but I can't figure out how to stop it without exiting the app. It doesn't even stop if I unplug the keyboard. 2. If the cable gets knocked or unplugged it creates a new device in the MIDI input menu so I have to reselectand and guess which one is working. Hope both can be fixed. Samsung Note 10+, Korg Microkey V1

This is an extremely useful, well laid out app. I use it mainly as a portable midi controller keyboard for my mini-synths (being able to pitchbend is an improvement over the keyboard of the hardware synth) but you could also play from a sequencer into this. Makes for a fun and versatile OTG songwriting/jam tool, and an easy way to add pitchbend to synth sounds. The price is accessible and great value for what you get!

I have just downloaded the app today. I really like how you're able to apply filters to the sound the synth makes. There are some things that might need some work: For a synthesizer, the learning curve seems to be low, but it's still rather alien to someone like me, who is still learning how to use a synthesizer fully. The app could benefit from a glossary of terms and an explanation of each function. It's unclear how to use microtonal tunings. A tutorial would be extremely helpful.

What’s new

Minor bug fixes