what is an expression pedal Line 6 EX1 Expression Pedal

what is an expression pedal Line 6 EX1 Expression PedalCondition Note: Cosmetic flaws and blemishes. Add an EX 1 Expression Pedal to your Line 6 gear to control of a dizzying array of possibilities. Control volume and wah, modify the length of your delay time, dial up the reverb mix, change the depth of your tremolo, and much more. A Few Features: Save two versions of your presets. Save two versions of your presets heel and toe and morph effortlessly between each one. For example, connect an EX 1

Condition Note: Cosmetic flaws and blemishes.
 

Add an EX-1™ Expression Pedal to your Line 6 gear to control of a dizzying array of possibilities. Control volume and wah, modify the length of your delay time, dial up the reverb mix, change the depth of your tremolo, and much more.

A Few Features:

Save two versions of your presets. 
Save two versions of your presets - heel and toe - and morph effortlessly between each one. For example, connect an EX-1 Expression Pedal to a DL4™ Delay Modeler and morph from short analog delays with no modulation to long echoes with a vibey chorus.

Control pitch effects.
Drop some dive bombs! M9 and M13 Stompbox Modelers feature pitch effects like Pitch Glide (which boasts a four-octave range), that can be controlled via an EX-1 Expression Pedal.

Create custom wahs.
Use an EX-1 Expression Pedal to create your own custom wahs. Try it with the Q-Filter model in FM4 Filter Modeler, and other stompbox modelers. Plus, take full advantage of the variety of vintage and modern wah models in M9 and M13 Stompbox Modelers.

Volume control. 
Create expressive fade-in and fade-out volume swells. Connect an EX-1 Expression Pedal to an M9 or M13 Stompbox Modeler, and check out the Volume Pedal model for sweet, pedal steel-style swells.