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Yul — Gugak Tuner & Jangdan

A tuner and rhythm trainer for Korean traditional instruments, with a yul-name tuner, jangdan on a jeongganbo grid, and theory articles in one app.

A tuner that shows the nearest yul name (黃, 太, 仲 …) and the deviation in cents
Reference tones from real daegeum and piri recorded by the National Gugak Center
Dozens of court, folk, pungmul and gut rhythms played on a jeongganbo grid
Chain rhythms together and tap cells to make your own pattern
Theory articles in Korean, English and Japanese, jangdan explanation cards, and recording, sigimsae and practice (one-time purchase)

App StoreTuner, jangdan and theory free · recording, sigimsae and practice: one-time purchase (₩6,600 on the Korean store)

Jangdan you can see and hear

The current cell follows along as it plays. Change the BPM or tap cells to make your own pattern.

Play several jangdan in sequence, such as the Sanjo chain from jinyangjo through jungmori, jungjungmori and jajinmori to hwimori.

Read about the twelve yul, jo and tori, sigimsae, instruments and tuning, and how to read jeongganbo, in Korean, English and Japanese.

Play a note into the tuner
The nearest yul name and the deviation in cents appear. Set hwangjong to the court-music standard (Eb) or to any Hz you type.
Tune against the reference tone
Listen to the daegeum or piri reference recorded by the National Gugak Center, and tune gayageum, geomungo, haegeum and ajaeng string by string.
Pick a jangdan and play it
Choose a rhythm in the Jangdan tab, set the BPM and follow the jeongganbo grid.
Read the theory behind it
Use the Theory tab and each jangdan's explanation card to learn yul, jo, sigimsae and how to read jeongganbo.