Publishers of technology books, eBooks, and videos for creative people

Home > Articles > Apple > Operating Systems

This chapter is from the book

Fixing Notes in the Piano Roll Editor

Previously, you used the Score Editor as a guide while you practiced the bass part. For this exercise you’ll work with the Piano Roll Editor to modify the length and position of the individual bass notes to fix any timing issues your recording may have.

  1. Move the playhead to bar 9 in the timeline.
  2. Select the Fingerstyle Bass track containing your new recording.
  3. Press E to display the Score Editor. Click the Piano Roll button to display the Piano Roll Editor.

  4. Swipe over the region in the Piano Roll Editor display area left or right, or drag the horizontal slider at the bottom of the editor (which appears when you swipe) to position the beginning of the region (bar 9) at the beginning of the visible area of the editor. Also adjust the horizontal zoom slider in the editor or pinch on your touchpad as needed until the grid shows each beat in the measure. The beats are listed in the editor ruler as a decimal point after the bar number, such as 9.3 for the third beat of bar 9.

    Human performances usually aren’t perfect. Sometimes the imperfections in music add subtle nuances and feeling to a song. In fact, you probably could get away with your recording as is, with no additional editing. However, since you need to learn how to edit anyway, let’s fix it.

    Each note (represented by a green bar in the Piano Roll Editor) should start exactly on a beat. The long notes should start exactly at the beginning of a measure (bar). To fix the timing or position of a note in the Piano Roll Editor, you simply click and drag the note in the middle to move it, and on the edge to trim or lengthen it.

  5. Drag the first note in the region to the left until it starts at the first beat (beginning) of bar 9. Chances are, your first note will not look exactly like the one shown in the screenshot. Regardless of its length, you’ll need to move the first note to the beginning of bar 9.

    Notice that when you select a note, the Notes tab at the top of the Piano Roll Editor inspector turns blue.

  6. Drag the second note to the fourth beat of bar 9 (9.4).

As you can see, fixing notes individually is not difficult. However, if you are working with a long region or a lot of notes, this process can become rather tedious.

Quantizing Notes in a Region

Rather than manually moving each and every note in a region to fix the timing, you can quantize the timing. Quantizing is a digital music term for automatically fixing timing based on set parameters. In this case, GarageBand will automatically move all the notes to the nearest gridline based on the settings in the Piano Roll Editor inspector.

You can use the Time Quantize button to fix the timing of all the notes in an entire region or selected notes. These timing changes are nondestructive. The original timing is never lost, so you can turn off Time Quantize at any time to return to the original recorded timing.

One thing to keep in mind is that the Time Quantize feature is selection based. If you have a note selected, only that note will be fixed. To fix all the notes in a region at once, you need to first deselect any notes. The Piano Roll Editor inspector controls change depending on whether you have a region (all notes) or individual notes selected. The Region or Notes tabs change automatically based on your selections.

  1. Click any empty space in the editor display area to deselect all notes within the region. The top of the inspector shows which items will be modified.
  2. In the Piano Roll Editor inspector, type My in the Region Name field so that the name of the region changes to My Fingerstyle Bass. Press Return to implement the change. This will help distinguish your recording from the one provided in the starting version of the project.

  3. In the Piano Roll Editor inspector, click the Time Quantize pop-up menu and choose 1/16 Note. Perfect timing—instantly!

    The Strength slider is only available when an entire region is selected. Leave the Strength slider set to 100. Lowering the strength decreases the amount of quantization.

  4. Press E to hide the Piano Roll Editor. Press K to kill the click track (to turn off the metronome).
  5. Play the project from bar 9 to 17 to hear your edited recording in action. Well done!

    Now that your recording is finished, you don’t need the original Fingerstyle Bass track. To delete the track, let’s use the shortcut menu in the track’s header.

  6. Control-click (or right-click) the track header for the top Fingerstyle Bass track. Choose Delete Track from the shortcut menu. Click OK in the warning dialog that says “There are regions in this track!”

  7. Save your progress.

Peachpit Promotional Mailings & Special Offers

I would like to receive exclusive offers and hear about products from Peachpit and its family of brands. I can unsubscribe at any time.


Pearson Education, Inc., 221 River Street, Hoboken, New Jersey 07030, (Pearson) presents this site to provide information about Peachpit products and services that can be purchased through this site.

This privacy notice provides an overview of our commitment to privacy and describes how we collect, protect, use and share personal information collected through this site. Please note that other Pearson websites and online products and services have their own separate privacy policies.

Collection and Use of Information

To conduct business and deliver products and services, Pearson collects and uses personal information in several ways in connection with this site, including:

Questions and Inquiries

For inquiries and questions, we collect the inquiry or question, together with name, contact details (email address, phone number and mailing address) and any other additional information voluntarily submitted to us through a Contact Us form or an email. We use this information to address the inquiry and respond to the question.

Online Store

For orders and purchases placed through our online store on this site, we collect order details, name, institution name and address (if applicable), email address, phone number, shipping and billing addresses, credit/debit card information, shipping options and any instructions. We use this information to complete transactions, fulfill orders, communicate with individuals placing orders or visiting the online store, and for related purposes.


Pearson may offer opportunities to provide feedback or participate in surveys, including surveys evaluating Pearson products, services or sites. Participation is voluntary. Pearson collects information requested in the survey questions and uses the information to evaluate, support, maintain and improve products, services or sites; develop new products and services; conduct educational research; and for other purposes specified in the survey.

Contests and Drawings

Occasionally, we may sponsor a contest or drawing. Participation is optional. Pearson collects name, contact information and other information specified on the entry form for the contest or drawing to conduct the contest or drawing. Pearson may collect additional personal information from the winners of a contest or drawing in order to award the prize and for tax reporting purposes, as required by law.


If you have elected to receive email newsletters or promotional mailings and special offers but want to unsubscribe, simply email

Service Announcements

On rare occasions it is necessary to send out a strictly service related announcement. For instance, if our service is temporarily suspended for maintenance we might send users an email. Generally, users may not opt-out of these communications, though they can deactivate their account information. However, these communications are not promotional in nature.

Customer Service

We communicate with users on a regular basis to provide requested services and in regard to issues relating to their account we reply via email or phone in accordance with the users' wishes when a user submits their information through our Contact Us form.

Other Collection and Use of Information

Application and System Logs

Pearson automatically collects log data to help ensure the delivery, availability and security of this site. Log data may include technical information about how a user or visitor connected to this site, such as browser type, type of computer/device, operating system, internet service provider and IP address. We use this information for support purposes and to monitor the health of the site, identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents and appropriately scale computing resources.

Web Analytics

Pearson may use third party web trend analytical services, including Google Analytics, to collect visitor information, such as IP addresses, browser types, referring pages, pages visited and time spent on a particular site. While these analytical services collect and report information on an anonymous basis, they may use cookies to gather web trend information. The information gathered may enable Pearson (but not the third party web trend services) to link information with application and system log data. Pearson uses this information for system administration and to identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents, appropriately scale computing resources and otherwise support and deliver this site and its services.

Cookies and Related Technologies

This site uses cookies and similar technologies to personalize content, measure traffic patterns, control security, track use and access of information on this site, and provide interest-based messages and advertising. Users can manage and block the use of cookies through their browser. Disabling or blocking certain cookies may limit the functionality of this site.

Do Not Track

This site currently does not respond to Do Not Track signals.


Pearson uses appropriate physical, administrative and technical security measures to protect personal information from unauthorized access, use and disclosure.


This site is not directed to children under the age of 13.


Pearson may send or direct marketing communications to users, provided that

  • Pearson will not use personal information collected or processed as a K-12 school service provider for the purpose of directed or targeted advertising.
  • Such marketing is consistent with applicable law and Pearson's legal obligations.
  • Pearson will not knowingly direct or send marketing communications to an individual who has expressed a preference not to receive marketing.
  • Where required by applicable law, express or implied consent to marketing exists and has not been withdrawn.

Pearson may provide personal information to a third party service provider on a restricted basis to provide marketing solely on behalf of Pearson or an affiliate or customer for whom Pearson is a service provider. Marketing preferences may be changed at any time.

Correcting/Updating Personal Information

If a user's personally identifiable information changes (such as your postal address or email address), we provide a way to correct or update that user's personal data provided to us. This can be done on the Account page. If a user no longer desires our service and desires to delete his or her account, please contact us at and we will process the deletion of a user's account.


Users can always make an informed choice as to whether they should proceed with certain services offered by Adobe Press. If you choose to remove yourself from our mailing list(s) simply visit the following page and uncheck any communication you no longer want to receive:

Sale of Personal Information

Pearson does not rent or sell personal information in exchange for any payment of money.

While Pearson does not sell personal information, as defined in Nevada law, Nevada residents may email a request for no sale of their personal information to

Supplemental Privacy Statement for California Residents

California residents should read our Supplemental privacy statement for California residents in conjunction with this Privacy Notice. The Supplemental privacy statement for California residents explains Pearson's commitment to comply with California law and applies to personal information of California residents collected in connection with this site and the Services.

Sharing and Disclosure

Pearson may disclose personal information, as follows:

  • As required by law.
  • With the consent of the individual (or their parent, if the individual is a minor)
  • In response to a subpoena, court order or legal process, to the extent permitted or required by law
  • To protect the security and safety of individuals, data, assets and systems, consistent with applicable law
  • In connection the sale, joint venture or other transfer of some or all of its company or assets, subject to the provisions of this Privacy Notice
  • To investigate or address actual or suspected fraud or other illegal activities
  • To exercise its legal rights, including enforcement of the Terms of Use for this site or another contract
  • To affiliated Pearson companies and other companies and organizations who perform work for Pearson and are obligated to protect the privacy of personal information consistent with this Privacy Notice
  • To a school, organization, company or government agency, where Pearson collects or processes the personal information in a school setting or on behalf of such organization, company or government agency.


This web site contains links to other sites. Please be aware that we are not responsible for the privacy practices of such other sites. We encourage our users to be aware when they leave our site and to read the privacy statements of each and every web site that collects Personal Information. This privacy statement applies solely to information collected by this web site.

Requests and Contact

Please contact us about this Privacy Notice or if you have any requests or questions relating to the privacy of your personal information.

Changes to this Privacy Notice

We may revise this Privacy Notice through an updated posting. We will identify the effective date of the revision in the posting. Often, updates are made to provide greater clarity or to comply with changes in regulatory requirements. If the updates involve material changes to the collection, protection, use or disclosure of Personal Information, Pearson will provide notice of the change through a conspicuous notice on this site or other appropriate way. Continued use of the site after the effective date of a posted revision evidences acceptance. Please contact us if you have questions or concerns about the Privacy Notice or any objection to any revisions.

Last Update: November 17, 2020