Echo Scale is a professional microtonal MIDI tool that lets you create and map custom scales and tunings to pitch bend messages, making it possible to play accurate microtonal music on any synth or hardware that supports MPE or standard pitch bend. Currently on a limited‑time introductory price of $59.99 (regular $79.99), it is one of the most precise and flexible solutions available for non‑12‑TET composition on iOS and macOS.
The app allows you to define arbitrary divisions per octave, import Scala (.scl) files, offset individual notes, and transpose globally while sending polyphonic pitch‑bend data in real time. It works as both a standalone app and an AUv3 MIDI effect, so you can insert it anywhere in your signal chain inside Logic Pro for iPad, AUM, GarageBand, or Cubasis. Universal purchase covers iPhone, iPad, and Mac (Apple Silicon) with no extra cost, and the community is already sharing custom scales for Bohlen‑P, just intonation, Arabic maqam, Indian shruti, and many more temperaments.
Users on forums report that the mapping remains rock‑solid even with demanding controllers like the Haken Continuum, Osmose, or ROLI Seaboard — something cheaper alternatives often struggle with. The preset system and export/import functions make it easy to share tunings with collaborators or move between devices. While the initial setup for very exotic scales takes a few minutes, most people find the workflow becomes transparent and reliable after a short learning period.
Key features include:
- Custom scale creation with arbitrary divisions per octave
- Full MPE polyphonic pitch‑bend mapping
- Per‑note tuning offset and global transposition
- Scala (.scl) file import/export and community preset sharing
- Standalone + AUv3 MIDI effect on iPhone, iPad & Mac
App price: $59.99 (introductory; regular $89.99)
In‑app purchases: None
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