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.