Glissa, Expressive Glissando Instrument
A private mobile musical instrument whose signature is continuous glissando (slide smoothly between notes with Keys, Glide and Auto modes) backed by an FX rack, instrument morphing, sampled packs, and a Pro tier with cloud sync.
Business Context
Expressive control is what separates a toy from an instrument. Continuous glissando plus a real FX/morph chain gives players something they cannot get from a keyboard clone, and the Pro tier turns that expressiveness into a sustainable product with recording, sync, and billing.
Strategic Value
Glissa is a full consumer-app pattern: a real-time audio engine with a distinctive expressive feature, a freemium-to-Pro ladder (own auth + RevenueCat billing), local recording, and a cloud backend for sync, all in a cross-platform mobile app shipped as a standalone build.
The Challenge
Touchscreen instruments mostly imitate piano keys: discrete, quantized, expressively flat. The hard and interesting thing is continuous pitch: letting a finger slide between notes the way a voice or a slide guitar does, in real time, on a phone, without audible artifacts.
Our Approach
Glissa's signature feature is continuous glissando with three modes (Keys, Glide and Auto) for sliding expressively between pitches. On top of the synth sits an FX rack, instrument morphing, and a sampled-pack path for richer timbres. A Pro suite adds local recording, account management, cloud sync, and billing (own-JWT auth + RevenueCat), with a cloud backend (FastAPI + Postgres) behind it. A two-finger octave pan and an options sheet round out the playing surface.
Key Performance Indicators
| KPI | Baseline | Result | Impact |
|---|---|---|---|
| Expressiveness | Discrete keyboard taps | Continuous glissando (Keys / Glide / Auto) | An instrument, not a key clone |
| Product model | Free demo only | Freemium → Pro (auth + billing + sync) | Sustainable consumer app |
Proprietary, source code not publicly available
Architecture
glissa architecture
Slide between the notes
Glissa is a private mobile musical instrument built around continuous glissando (slide smoothly between pitches with Keys, Glide and Auto modes) over an FX rack, instrument morphing, and sampled packs. A Pro suite adds recording, cloud sync, and billing on top of a FastAPI + Postgres backend.
This is proprietary work; the app is private. The card describes the architecture and intent without exposing internal logic.
Technology Stack
Visual assets for this project are not publicly available.
This is a proprietary project. Source code and external resources are not publicly available.