Specification :

7TH HEAVEN
Designed specifically for 7-string guitars with the input from some of Ibanez° hottest 7-string players, the SH7 Seventh Heaven distortion pedal accentuates the low-end girth of the 7-string while reducing unwanted string noise. A special mode switch allows you to choose between two different distortion voicings while Lo, Hi, Drive, and Level knobs give you total tone control. An absolute must-have effect for replicating the best 7-string sounds of others or creating your own individual tones.

http://www.ibanez.co.jp/world/products/effects/manual/sh7.pdf