Resona Part Trainer

Practice on your own,as if you were singing together.

An online practice service for a cappella and vocal ensembles where you can hear every part sung by a real vocalist and sing along.

Try it with ArirangFor teams & organizations

Try the public AYAC set-piece demo without creating an account.

Learn at home · Rehearse together

What is Part Trainer?

From reading the score to actually singing together

Each part is performed by a real vocalist, helping you learn your line before rehearsal and practice how it feels alongside the other voices.

Follow Real Voice

Follow a human voice

Practice with a real singer and hear pronunciation, breathing, and phrasing—not just pitches from an instrument.

Focus on Voice

Choose the voice part you need

Choose the voice part you want to practice, listen and sing along, and focus on learning your part.

Practice Anytime

Practice whenever you need

Even without your ensemble nearby, practice online whenever and as often as you like.

Why Part Trainer?

We rehearse together, but most preparation happens alone

It is rarely possible for every member to meet as often as they would like. Everyone needs a practical way to prepare before the full rehearsal.

  • When learning your line accurately from the score alone is difficult
  • When MIDI or piano guides do not show how the part should really be sung
  • When you know your line alone but lose it as other voices enter
  • When rehearsal time is spent relearning notes instead of making music

From Practice to Music

Learn your part in your own time. Make deeper music together.

When the notes are prepared in advance, rehearsal can move beyond checking pitches and focus on the musical qualities that only emerge when people sing together.

BalanceBlendGrooveExpression

Who Needs Part Trainer?

For every moment between solo practice and ensemble rehearsal

Use it as an individual singer, a school or club, an a cappella group, or a project ensemble.

When you want other voices beside you

Hear the other parts and sing your line even on days when there is no rehearsal.

When rehearsal time is limited

Prepare individually, then spend valuable time together on the elements that require the full group.

When hearing helps more than reading alone

Combine the score with a real voice and learn your part in the way that works for you.

When you need to sing within other parts

Experience maintaining your line while several different voices are sounding around you.

How It Works

Use a variety of practice features

Choose the features you need and practice freely in your own way.

  1. 01

    Choice Part, Listen and sing

    Choose the voice part you need, listen to it, and sing along.

  2. 02

    Change Score Size

    Resize the score to suit your needs.

  3. 03

    Keep Tempo

    Use the metronome to practice keeping a steady tempo.

  4. 04

    Change Tempo

    Practice the song at different speeds.

  5. 05

    Control Volume

    Adjust the volume of each voice part for harmony practice.

  6. 06

    Repeat

    Select the section you want to practice and repeat it.

Featured Project

AYAC

2026 Asia Youth A Cappella Competition

In use today

An online practice space for a competition set piece

Part Trainer lets participants in the 4th K-A Cappella Festival prepare their own voice part for the set piece ‘Arirang’ before meeting the full ensemble.

Open the set-piece Part Trainer

For Teams & Organizations

We can create a Part Trainer for your project

We produce custom Part Trainers when many people need to learn the same repertoire, from competition set pieces and classroom songs to performance projects.

Competition and festival set pieces
School and educational repertoire
Workshop and masterclass repertoire
Choir and a cappella performance songs

Custom Production

Does your project need a Part Trainer?

Resona reviews your score and project goals, records the required parts with real vocalists, and builds an online Part Trainer for your participants.

  • The song and score to produce
  • Expected participants and required parts
  • Purpose and preferred schedule
Ask about custom production

[email protected]

Practice your part with real voices.

Practice in your own time. Make deeper music together.

Bridge the space between practicing alone and rehearsing together by listening to and singing with real human voices.

Try Part Trainer