I don't have a PA4x but I do have a like new DS1H Sustain pedal for it so that's a start !
Seriously the pedal will do half damping and is in great condition $25 + Shipping
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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