I'm not positiive but I beleive you cas assign either a drawbar setting or one of your extra voices to the pedals. I think you can only assign one extra voice at a time. I played pedals with my XK3 using a drawbar sound as it had no extra voices.

Check this out.

http://www.suzuki-music.co.jp/en/pdf/00457-40173_v160web.pdf
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Bill in SC --- Roland BK9 (2) Roland BK7M, Roland PK5 Pedals, Roland FP90, Roland CM30 (2), JBL Eon Ones (2) JBL 610 Monitor, Behringer Sub, EV mics, Apple iPad (2) Behringer DJ mixer