Ground Zero Add-a-Stage

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Plug-in type modules are great. And easy to use with no electrical/ technical knowledge needed. However, they offer limited flexibility in making your amp sound exactly how you want. 

1) Add-a-Stage is FULLY configurable. Meaning you can change the circuit component values to get exactly the tone, response and dynamics for your amp. No compromises with Add-a-Stage. Just full flexibility to tailor your tone. 

2) You  can choose where to place Add-a-Stage in your signal path. Plug in modules can only go in one position. Add-a-Stage can be placed anywhere. It can go before the entire preamp, or in-between gain stages. 

3) Add-a-Stage is switchable. You can add or remove the extra gain at the flick of a switch or press of a foot switch button. This is unbeatable for live use, where you can boost the gain for solos etc...on demand. 

Most any type of switch will work, including toggle switches, push/pull switched pots and foot switch jacks. The Add-a-Stage relay is activated by adding or removing ground to the switch (SW) pad on the board, making wiring streamlined and effortless. 

Using a push/pull pot eliminates the need to drill a hole for an added toggle switch etc...and keeps the front panel clean. 

Placing the Add-a-Stage in front of the first preamp tube acts as a sort of "boost." This method has a good amount of low end response and a bit "woolier" tone. But not loose or flubby, by any means. 

Inserting Add-a-Stage between stages, such as before V2A in a Marshall, results in a tighter, leaner and more aggressive tone. The gain feels just a little higher and the attack is sharper. 

Both positions are great. And it's easy to configure Add-a-Stage either way. Experimenting with both methods it's easy and convenient.