# Harmonicon adds harmonica bending trainer with live pitch feedback

> **Key takeaway:** The open-source music practice tool Harmonicon has gained a dedicated bending trainer that visualizes pitch in real time to help harmonica players learn note-bending technique.

**Published:** 2026-10-18T00:00:00+00:00 
**Source:** Planet KDE (Desktop Engineers) 
**Category:** distro-planet 
**Canonical URL:** https://fosswire.org/news/harmonicon-adds-harmonica-bending-trainer-with-live-pitch-fe.html 

## Summary
Tomaz Canabrava has detailed a new bending trainer screen in Harmonicon, an open-source harmonica practice application built with Rust and the Bevy game engine. The trainer addresses the core difficulty of learning harmonica bends — the technique is invisible and beginners cannot judge by ear whether they are doing it correctly. The tool provides real-time pitch visualization, structured practice drills, and progress tracking across all harmonica techniques including overblows and overdraws.

## How the bending trainer works
- **Pitch detection via FFT**: The trainer uses an FFT-based pitch detector, with the current example set to "C harp · FFT"
- **Three-part UI**: Settings strip at top, target card in the middle showing current bend target and performance, harmonica diagram on the right displaying all possible notes by hole and technique
- **Real-time pitch rail**: Visualizes the player's pitch relative to target with a moving marker and dot trail showing recent history, revealing technique issues like scooping, overshooting, or unstable holds
- **Six practice modes**: Free exploration, find and hold, bend and release, repeated bends with metronome, bend ladder through multiple depths, and overbend response drills
- **Adaptive drill system**: When Drill is enabled, the trainer automatically selects targets based on practice history, prioritizing less-practiced or poorly-controlled bends
- **Progress persistence**: Session data and drill progress are saved between sessions; the harmonica diagram doubles as a progress map with color-coded reliability indicators

## Why it matters
The tool demonstrates a practical application of Rust and Bevy for audio-focused creative software, and fills a specific gap in open-source music education tools where instrument-specific learning aids remain rare.