The Mission Engineering EP-1-BK SPL is an expression pedal built to control a wide range of gear rather than any one device. RockBoard's PedalPedia says the EP-1 is compatible with a large range of digital amps, effects units, MIDI controllers and stomp boxes, and that it can be used anywhere you would use a Roland EV-5, M-Audio EXP, Boss FV500 or similar pedal1. If you are new to expression pedals, they let your foot sweep a parameter, such as delay time, reverb mix or a wah-style filter, on a device that supports one; see the Expression Pedals page for the wider picture.
How it is built and connected
The EP-1 features Mission's resilient metal chassis and is mechanically based on a classic wah housing, which gives it the familiar rocking footprint of a wah pedal12. Inside is a purpose-designed sealed 10K linear potentiometer, and a single 1/4-inch TRS output jack connects the pedal to your device with a TRS cable1. The product page lists the circuit type as digital1.
Writing in a gearnews.com buying guide to expression pedals, Julian Schmauch described the pedal as a dedicated expression controller with no extras2:
"It doesn't offer dual outputs, polarity switches, or extra modes" and "a single TRS expression output"
That simplicity is the point: one pedal, one output, one job. Players who need to control several devices from one footboard would look instead at something like the Mission Engineering Expressionator, a multi-expression controller in the same maker's range.
The spring load
The SPL in the name refers to the spring load. The EP-1 can be fitted with an optional spring load that will always return the pedal to heel down1. Mission gives two reasons a player might want that:
- Recreating the feel of a spring-loaded wah pedal, where the treadle springs back when you lift your foot1
- Use with auto on/off detection such as the Fractal Audio auto-engage feature, which depends on the pedal returning to its rest position1
Where it sits in Mission's range
Mission Engineering makes several versions and colors of the EP-1, including the EP-1, the EP-1 (Red), and models aimed at specific devices such as the EP1-KP Kemper and the SP1-L6 Helix. The EP-1-BK SPL is the black EP-1 with the spring load kit fitted1.
Videos
Reverb
Zack Seif Music
Questions
Is the Mission Engineering EP-1-BK SPL a replacement for a Roland EV-5?
Mission says the EP-1 can be used anywhere you would use a Roland EV-5, an M-Audio EXP, a Boss FV500 or a similar pedal. It is a dedicated expression controller with a single TRS output and no dual outputs, polarity switches or extra modes, so it suits players who want one straightforward pedal rather than a multi-output controller.
What kind of cable does the EP-1-BK SPL use?
A single 1/4-inch TRS output jack connects the pedal to your device with a TRS cable. That is the standard three-conductor cable used by most expression inputs on digital amps, effects units, MIDI controllers and stomp boxes.
What does the spring load do on the EP-1-BK SPL?
The EP-1 can be fitted with an optional spring load that always returns the pedal to heel down. Mission says this is great for players looking to recreate the feel of a spring-loaded wah pedal, or when using the pedal with auto on/off detection such as the Fractal Audio auto-engage feature.
Is the EP-1-BK SPL analog or digital?
The pedal's circuit type is listed as digital on its product page. In practice it works as a controller: a purpose-designed sealed 10K linear potentiometer sends the pedal's position down a single TRS output to the device it is connected to.
Does the EP-1-BK SPL work with Fractal Audio auto-engage?
Yes, that is one of the reasons for the spring load. Mission says the optional spring load kit, which returns the pedal to heel down, is useful when using the pedal with auto on/off detection such as the Fractal Audio auto-engage feature, which relies on the pedal returning to its rest position.
Sources (2)
- EP-1-BK SPL by Mission Engineering, RockBoard PedalPedia, 2026
- The 6 Best Expression Pedals: Taking your Effects to the Next Level, gearnews.com, 2026-02-02
