About RSJB
RSJB is an independent Brazilian studio building focused audio tools for iPhone, iPad and Mac.
Our principles
- ·100% on-device — processing happens locally, no cloud.
- ·No tracking, no ads, no analytics SDKs.
- ·No account and no subscription — one-time purchase.
- ·Crafted byte by byte, in Brazil.
The apps
Rsf2 — SoundFont 2 (.sf2) manager. Live on the App Store.
RDX — voice-cartridge librarian for 6-operator FM synths.
Tonic — analog-modeling synthesizer and AUv3 plug-ins.
Contact
Reach us at rs.felicio@gmail.com.