Korg Custom Shop GA-CS Chromatic Tuner - Black

by Korg

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  • Korg Custom Shop GA-CS Chromatic Tuner - Black

    Stunning visibility and pin-point precision, to go.
Compact tuner with ultra-high 0.1 cent precision.

    Card-type compact tuners have long-been KORG’s most popular tuners. The diverse lineup includes the GA series for guitar/bass and the multi-use CA series, and has continued to support the tuning needs of beginners and professionals alike. We now introduce a new model: the GA Custom.
The GA Custom features a large 3D visual meter, the first of its kind for a compact tuner. Three-dimensional lights and versatile display modes deliver an unprecedented level of visibility. Its ultra-high 0.1 cent tuning precision also meets professional needs. The flat body with rubberized exterior is even more compact and portable than ever. A high-sensitivity mic is built-in, allowing it to be used not only with guitar/bass but also with orchestral and acoustic instruments. The GA Custom is a new type of compact tuner that packs a ton of high-end functionality into a convenient and highly portable package.

    “Custom Shop,” the mark of ultimate quality

    KORG tuners have a 40-year history that began with the world’s first needle-style tuner. While we have produced many different types of tuners, including tuners with unrivaled precision and tuners with epoch-making functionality, these products were made possible by KORG’s unwavering commitment to quality. In other words, our attitude of sincerely listening to the voice of the user, our revolutionary ideas, and our high level of technological ability are what underlie the long history of KORG tuners. 
Now, KORG announces a new lineup aimed at achieving even greater accomplishments. The name “Custom Shop” designates this tuner as a flagship model that is representative of KORG’s highest levels of technology. Its design features a beautiful meter displayed by a CMD panel, ultra-precision detection, and careful attention paid to appearance and feel. KORG’s high technological ability and commitment to quality have taken shape as the “Custom Shop” name.

    3D visual meter creates a revolutionary visual effect

    The 3D visual meter exemplifies the Custom Shop series. A large and easily visible note name indication and the distinct movement of brightly illuminated LEDs make the pitch difference and change instantly

    Ultra-high tuning accuracy of +/- 0.1 cents

    Designed with the professional user in mind, KORG’s GA Custom offers extremely accurate tuning with a detection range of +/- 0.1 cents, a level of precision that is uncommon of compact tuners. With the GA Custom, players of all styles can now enjoy the same ultra-high precision offered in KORG’s flagship tuner, the Pitchblack Pro.

    Three meter display modes

    Three types of display modes are offered: Regular, Strobe, and Half Strobe. Each mode can be easily selected according to the user’s preference. Strobe and Half Strobe mode reflect the extreme precision of the GA Custom, making it more convenient to tune accurately.

    Compact flat design

    The meter display area has been made larger and easier to see, while the body has been made even more compact. The flat design is excellent for both visibility and portability. With a rubberized exterior, the body is also easy to hold. There’s a tilt stand on the rear, allowing you insert a pick to make the unit stand on its own.

    High-sensitivity mic is built-in

    In addition to the INPUT/OUTPUT jacks used when tuning an electric guitar or bass, there’s a built-in high-sensitivity mic that lets you use the unit for tuning not only acoustic guitar but also wind instruments, string instruments, or keyboard instruments. A CM-200 contact mic (sold separately) can also be used.

    Korg Custom Shop GA-CS Chromatic Tuner - Black Features:

    • “Custom Shop,” the mark of ultimate quality

    • 3D visual meter with revolutionary visual effects

    • Ultra-high tuning accuracy of +/- 0.1 cents

    • Three meter display modes

    • Compact flat design provides a large screen and easy portability

    • High-sensitivity mic is built-in, allowing use with acoustic & orchestral instruments


  • We want you to feel confident with your Prymaxe purchase, which is why when you purchase a new or demo (like new/gently used) product from us, you are automatically enrolled into our FREE Two Year Warranty.* 


    What is covered:

    • Brand new (non-clearance) and demo (like new, gently used) products that have been purchased within the last two years
    • Products that malfunction under normal use
    • Cost of repairs


    What is NOT covered:

    • Used (non-demo), vintage, and clearance products
    • Products purchased more than two years ago
    • Cost of shipping both ways
    • Items with clear signs of abuse (up to Prymaxe’s discretion)


    * We reserve the right to end this promotion at any time.


  • When you place an order at Prymaxe, you can rest assured that your item will be carefully packaged. Our shipping team is dedicated to making sure your item arrives in perfect condition and on time.

    All in stock orders placed before 2pm EST will ship same day and all orders placed after the cutoff will ship the next business day*. If you need an order immediately, please let us know and we’ll try our best to accommodate your request.

    * Our same day shipping policy may be temporarily suspended during a sale or if you pay with Affirm. Rest assured, we will do everything we can to get your order out as quickly as possible. Please call us at 1-855-PRYMAXE if you are placing an overnight order and need it to go out immediately.


    Domestic Shipping
    Most orders shipping within the US will ship via USPS or FedEx and are fully insured, we also offer express options if you need an item within 24 hours. All tracking numbers will be sent via email after the item is shipped. If you did not receive your tracking number please feel free to call or email us. 

    All US Orders Ship for FREE

    International Shipping
    We love and truly appreciate all of our International customers. All of our international shipments are fully insured and are guaranteed to be delivered or your money back. We offer a variety of shipping options for you to choose from and if for any reason there is an issue with your order we will make it right, that is our promise you. 

    Pre-Order Shipping: 

    Pre-Orders typically ship with 2 weeks. In the event a product is backordered we will contact you with an exact shipping timeframe. 

    Smaller items will ship USPS First Class. 

    USA shipping only for Vox, Korg, Voodoo Lab, MXR, Dunlop, Way Huge, Barber Electronics, Music Man, Tech 21, Fender, Marshall, PreSonus, Source Audio, and Strymon.

  • If you would like to return an item, please use the return widget at the bottom of this page to look up your order and start the return process. If you need assistance, or if the widget is not working for you, please email us at sales@prymaxe.com with our order number and reason for return.

    45-Day Satisfaction Guarantee

    If you are not 100% satisfied with your purchase, you can return it within 45 days of the original purchase date for a full refund. If an item is not received by us within the 45-day window, the package will be refused. All new items returned must be in BRAND NEW condition with zero signs of wear or use and must be returned in the original packaging with ALL materials (free/bundled items -- must be unused/unopened, warranty cards, plastic, pouches, manuals etc.). Demo (Like New/Gently Used) items must come back in the same condition they were sent to you, with all included materials, if applicable.

    Our 45-Day Satisfaction Guarantee covers brand new and demo (like new/gently used) products only -- it does not cover used and clearance products (see below). It also does not cover items in the “What is NOT Returnable” list below. Please note: All actual shipping fees paid by Prymaxe will be deducted from your refund. This includes orders that qualified for free or subsidized shipping. Return shipping must be paid by the buyer. If you received a defective or incorrect item, please see our FAQ section below.  


    * Prymaxe reserves the right to define abuse of the return policy on a case by case basis and consequently refuse subsequent return requests by said abuser and place them "All Sales Final".


    Used and Vintage: 

    All Used and Vintage items come with a 48 hour approval period. Please contact us directly at sales@prymaxe.com within 48 hours of receiving your product for us to set up a manual return for you. Be sure to include your order number and reason for return in the email. All Used/Vintage items must be returned in the same condition they were sent to you in, as well as include all materials that came with it.

    What is NOT Returnable:

    • Accessories (this includes all pickups, strings, picks, pedalboards, tuners, expression/volume pedals, etc.)
      • However, if you received accessories with the product as part of a bundle, the accessories must be returned with the product, and they must be unused and unopened
    • Clearance Items (Clearance items are clearly marked with "CLEARANCE" in the title)
    • Special/Custom Orders

    Return Instructions:

    All returns should be insured by the buyer and sent via UPS, Fedex, or USPS with tracking. Please do not write on or attach tape or labels to the product box -- use a packing box to return the product. Attach a shipping label with the RA number onto the shipping box.



    When will I get my refund?

    Once your return is received by us, your refund will typically be processed within three business days. It typically takes a few business days for all credit card refunds to be processed and reflected on your statement. This means it will take a few extra days for your refund to show in your account after your return is processed. Please note: All actual shipping fees paid by Prymaxe will be deducted from your refund. This includes orders that qualified for free or subsidized shipping. Return shipping must be paid by the buyer. If you received a defective or incorrect item, please see the next question.  

    What if I receive a defective or incorrect item?

    If a product is defective upon arrival, or the wrong item was received, we will send you a replacement/the correct item, and all the shipping fees will be covered by us. For defective items, Prymaxe reserves the right to refuse the return if we determine the reason for the unit failing was not covered under the warranty (i.e., if the item was damaged due to user fault or error). If you feel your item was damaged in shipping, please take plenty of pictures of the damaged box and item and immediately contact us so we can open a claim with the shipping company.

    Please be very diligent with testing your defective item. Be sure to try other guitars, power supplies, cables, and amps. We also request that you take a video of the item not working. If we receive your item, test it, and find it to be working, we will give you a refund minus the cost of shipping both ways.

    When will I get my replacement item?

    If a defective or incorrect item was sent to you, we will send out the replacement as soon as we get the defective/incorrect item back and approve/process the return (typically within three business days). If we do not have the replacement in stock, we will issue a full refund. If you need the replacement to be sent out immediately, please place a new order, and when we get the defective/incorrect item back, we will issue a full refund of the original order.

    When must I ship my return?

    Your return must be received by us within 45 days of the original purchase date. This means you must ship your return with enough time for us to receive the package within 45 day deadline. If it does not arrive within 45 days, we will refuse the package. If you feel you sent the package within a reasonable time frame, but it arrived late due to the shipping company’s error, please immediately contact us to make an appeal before we refuse the package.

    What if I pre-ordered an item?

    Even if you pre-ordered an item, we must still receive it within 45 days of your order date in order to give you a refund, so please only pre-order items you plan to keep. If your pre-ordered item arrives defective, you will have a 48 hour period to contact us for a replacement.

    Why was my package refused?

    There are a number of reasons your package could be refused by us, including:

    • It was a new/demo item received outside of the 45-day window
    • It was a clearance, accessory, or other non-returnable item
    • The package is missing items that were included in the original shipment
    • The item shows signs of wear
    • The original product box was damaged or written on/the item was not packaged in a separate shipping box

    Why is the widget not letting me return my item?

    If you have a valid reason for returning/exchanging a product that is within our return policy, but the widget will not let you start the return process, please contact us directly at sales@prymaxe.com with your order number and reason for return.

    Returns Widget

    Use the widget below to look up your order.

    If your order is not found, please make sure you added the number sign (#) in front of it.

    If your order is still not found, please email us at sales@prymaxe.com with your order number and reason for returning so we can create a manual return for you.