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Harmony Director 

HD-

300

 Use Guide

–For efficient practice and gaining a deeper appreciation for music–

Introduction

The Harmony Director HD-300 is packed with features that help a performer actively improve his or her abilities through 
independent and interactive learning. We hope that the act of listening back, reflecting on, and correcting one’s performance 
not only helps improve one’s abilities as a performer by internalizing what you have learned, but also offers new opportunities 
to enjoy music and helps provide a sense of enrichment.
This Use Guide describes the kinds of independent and interactive learning that can be incorporated into practice, and the 
kinds of band practice and instruction that is possible with the HD-300 using specific examples of each scene.

*For detailed operating instructions, refer to the separate “Owner’s Manual.”

A

B

Enhanced by HD-300

A

Practice using the Sound Back function

Scene:

Individual practice, part practice

Practice goals: 

Enhanced by HD-300

Enhanced by HD-300

Case 1: Part practice

Case 1: Part practice

Case 2: Ensemble practice

Case 1: Ensemble practice

Case 2: Post-practice review

Listening to one’s performance objectively can provide new insight. Share new facets noticed with your peers to help 
deepen your understanding of your own performing abilities.

You can record a part of concern during performance after when you have noticed it, starting at up to 10 seconds 

before. Facilitate efficient practice and develop each performer’s ability to play by themselves, by quickly recording 

and sharing parts that require additional instruction with them.

This is a useful iOS app that aids your daily practice routine. You can use this 

app to remotely control certain functions of the HD-300 by connecting to the 

HD-300 via Bluetooth®. This app also includes dedicated features for app, 

such as a chord detector, a tuner, and others.

*HD-300 Assistant is an app exclusive to the iPhone/iPad.

B

Practice using the Recording function

Part leader

Student

Practice using Time Shift Recording

Advanced

*Sound Back is trademark of Korg Inc.

*Recording starts several seconds before the [REC] button is pressed.

Play it yourself

Goal

Training one’s ability to 
listen and match others’ 
performances

Training one’s ability to 
recognize areas needing 
improvement

Training one’s ability for listening and matching pitch 
(Sound Back* function)

Quickly present points of concern (Time Shift Recording function)

Introducing the “HD-300 Assistant” app for iOS

Use the Sound Back function to listen and compare the performer’s tone and that of the HD-300. Use this to practice 
matching the pitch, training your listening and pitch recognition abilities in the process.

Owner’s Manual

 (page 29)

Develop the ability to match pitch by listening to the (surrounding) 

instruments without relying on a tuner.

Scene:

Part practice, ensemble practice

Practice goals: 

Develop one’s ability to analyze one’s performance objectively and 

to play towards a goal based on grounds.

Scene:

Part practice, ensemble practice

Practice goals: 

Quickly present points of concern to the practice partner to help 

facilitate practice.

Imagine the correct pitch

Aim for the correct pitch, and 

eliminate the interference beat 

while playing

Match pitch to surrounding 

sounds (Ability to listen and 

match pitch)

Try imagining the correct pitch when playing. 

If there is an interference beat, try correcting 

the pitch.

Let’s record the selected section 

and listen to it.

Listen to this recorded part 

and share your thoughts with 

the group.

I think the rhythm at the 

beginning was tight.

First, let’s play the piece 

in full.

I’ll play back the part 

I’m concerned about. 

Make sure to practice 

in instrument groups.

Listen carefully to the 

sound of 

G

 and try 

playing a harmony.

Let’s play the piece 

through to the end one 

last time.

Check areas of concern later 

using the score

The pitch at the end was a little 

unstable. Let’s keep this in mind 

when playing again.

The rhythm wasn’t tight enough, 

so let’s try it again and make it tight.

The HD-300 will identify the sound 

and play it back at the correct pitch 

in a few seconds.

Training one’s ability to recognize areas needing 
improvement in a performance, or capturing and sharing 
a performance in its entirety (Recording function)

Owner’s Manual

 (page 26)

Owner’s Manual

 (page 27)

Listen and think

Listen and think

Playing while being aware 

of challenges

Share opinions and deepen 

one’s understanding

Develop the ability to play 

with a goal in mind 

(Recognition ability)

Part leader

Student

Share opinions

Share opinions

Before playing:

Press the 

[TIME SHIFT 

RECORDING]

 button to 

put it in standby.

While playing:

Press the 

[REC]

 button 

when you feel like you 

want to record the section.

After playing:

Press the 

[

R

/

J

]

 button 

to play back the 

recording.

Example: Confirm chord while playing (chord detector)

EN

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