A.In most cases, the FS-5L should not be substituted for an FS-5U. If a Roland or BOSS product specifies the use of an FS-5U, connecting an FS-5L won't hurt anything. However, you'll have to press the FS-5L twice to perform a foot switch-controlled operation. This is impractical for normal use, and is not recommended.
(2006/02/09)