The Formula B That Screamer Overdrive Pro 4558 is an overdrive pedal that delivers the three classic Ibanez Tube Screamer flavors, the TS808, TS9 and TS10, in a single enclosure, using rare components according to Guitar Pedal X's review1. It sits in the crowded field of overdrive pedals built around the Tube Screamer circuit, but instead of committing to one voicing, it lets the player choose between them.
What it does
The pedal's three voicings are selected by two internal switches rather than external controls. Guitar Pedal X's Stefan Karlsson described the arrangement1:
"You have 2 internal switches which select which Screamer flavour you are applying - the left switch is TS9|TS10 / TS808, and the right one is TS10"1
Stefan Karlsson, Guitar Pedal X1
The switching logic works like this1:
- Right switch to the right: TS9 or TS808 flavors
- Right switch to the left: TS10 or TS808 flavors
- The TS808 and TS10 modes can be applied together
Because the switches are internal, changing voicing means taking the pedal off the board and opening it up, so it suits a player who will settle on a flavor rather than switch between them mid-song1.
How it compares
Guitar Pedal X placed the That Screamer alongside other multi-Screamer pedals, noting that it "also features the 3 classic Screamer Voicings" while keeping the classic three-knob design rather than adding the extra mod controls found on some rivals2. Karlsson's verdict on the pedal was straightforward:
"While If I was looking to add one more to my Screamer Reference Collection - the That Screamer would definitely be my first choice."1
Stefan Karlsson, Guitar Pedal X1
Videos
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Questions
How do the internal switches on the That Screamer Overdrive Pro 4558 work?
The pedal has two internal switches that select which Screamer flavour is applied. The left switch chooses between TS9/TS10 and TS808, and the right switch chooses between TS10 and TS808. With the right switch to the right you get TS9 or TS808 flavours, and with it to the left you get TS10 or TS808. The TS808 and TS10 modes can also be applied together.
How much does the That Screamer Overdrive Pro 4558 cost?
As of January 2025, Guitar Pedal X listed the pedal at $239 USD, which the same review also gave as €199 EUR and £179 GBP.
Sources (2)
- Guitar Pedal X, Guitar Pedal X, 2025-01-21
- Guitar Pedal X, Guitar Pedal X, 2025-10-10
