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Utilise the headroom in your amp as your boost. Easily switch between 2 extra master volume controls for your amp or your pedalboard.

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Love the tone of your amp? Want to get more out of it without drastically changing your sound or gain structure? 


TheGigRig UnderLiner has been designed to sit in your amps’ effects loop and give you 2 extra master volume controls enabling you to set 2 different attenuated rhythm levels and then use the bypass setting as your boost. 


UnderLiner also features an active loop enabling you to integrate effects in your amps’ effects loop with no tone loss from long cable runs. 


Switch between your settings with the included UnderLiner FS Footswitch which will also provide power to the UnderLiner sitting back at your amp. 

UnderLiner is also remote switch and MIDI enabled so you can program the UnderLiner as part of your presets with G3/G2/Atom or any other programmable remote switch or MIDI controller.

Take control of your volume by getting the most out of your amp with TheGigRig UnderLiner.


2 Extra Master Volume Controls

Instantly switch between 2 extra master volume controls and a master bypass giving you 3 preset volume levels for your amp or your pedalboard

MIDI Controlled

Switch instantly using the supplied UnderLiner FS Footswitch, external programable control switch or with MIDI

Integrate Your Amp Loop Effects

UnderLiner features its own effects loop specifically designed to handle anything from instrument to huge line level signals with 34Vdb of headroom

Powered From Your Pedalboard

The UnderLiner FS Footswitch will supply power to the UnderLiner so no need for a separate 9V supply back at the amp








UnderLiner 0.3kgs

UnderLiner FS - 0.16kgs

Boxed 0.8kgs

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  • Is my item in stock?
    We have an automatic stock system that updates stock levels and we restock weekly. If ,however, the item has a wait list or is temporarily out of stock, you will see the expected shipping date on the item's main product page. If you have any query about availability, just get in touch.
  • Do I pay VAT?
    VAT will only be charged at checkout if your order is delivered in the UK. For EU/ International customers: VAT/TAX Paid at Point of Arrival. Tax charged at the point of arrival of goods into your country rather than paying any tax at the point of purchase. The price you see when browsing or adding items to your basket will exclude Tax. The rate of VAT/TAX charged at the point of arrival will be that of your country of delivery. This applies to all orders that you have with The GigRig. VAT/TAX will be calculated at the appropriate rate on the total net value or goods + duty where applicable. When your goods are despatched and arrive in your country you will be contacted by the Carrier (UPS/Royal Mail/Local Mail Carrier) and it is at this point that you will pay the local VAT & Duty due on your purchase. The carrier will make it as quick and efficient as possible by completing and paying these on your behalf to ensure there is minimal delay to you getting your goods. Please note the carrier will include a disbursement fee with your VAT & Duty Bill for using these services. All countries outside the UK are VAT exempt so the 20% VAT will be removed at checkout when you enter your details. You will be liable for any local taxes charged US Orders - Now dispatching from the UK and delivered direct to you Duty Paid via FedEx International Connect Plus (unless an alternative method is selected at Checkout).
  • How long does it take to Ship?
    We dispatch Monday to Friday We offer Same Day dispatch for in stock items up to 12:00PM GMT. In stock orders placed after these cut off times will be processed for dispatch the Next Working Day. Orders placed after the cut off times on Friday will ship the following Monday (with the exception of Public Holidays), providing all ordered items are in stock. Please be aware that not all services are available for all items due to their size/weight or value. Please allow 48 hrs for digital delivery of Custom Power Path orders. Orders placed for this service after 12pm (GMT) on a Friday will be processed Next Working Day (Monday with the exception of public Holidays). If you fail to receive your diagram, please first check your junk mail folder of the email address provided. If you still have not received it, please get in touch to let us know Estimated delivery dates will be provided for out of stock items on their product pages. We endeavour to provide the most accurate estimate possible however dispatch times may be extended due to unforeseen production or logistic delays. Further shipping information available here
  • Where will my order ship from?
    All domestic and international orders ship directly from our headquarters in the UK unless purchased via our select number of international dealers.
  • What Warranty do you offer?
    We offer a 30-day no question money back guarantee. Item must be returned in a saleable condition.In addition we offer a 2 year manufacturers warranty for the repair or replacement of faulty goods. If there is anything we can help you with, just get in touch and we'll get you sorted. We offer a 30-day no question money back guarantee. Item must be returned in an unused, saleable condition. In addition we offer a 2 year manufacturers warranty for the repair or replacement of faulty goods. If there is anything we can help you with, just get in touch and we'll get you sorted. More information is available here
  • Can you guys build my pedalboard?
    Yes! We now offer various custom pedalboard service - CLICK HERE to find out more!
  • Can you tell me what I need to buy to power my pedals?
    Sure, just purchase a Power Path diagram and we'll send you a diagram and list of the most efficient way to power your gear!
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