The answer differs depending on the type of wah used.
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PEDAL WAH: You can use one only wah effect in the PEDAL FX block.
You can control the wah effect in real time by operating the expression pedal of the unit (GT-1000), or an expression pedal connected to the CTL/EXP jacks. -
AUTO WAH: You can use multiple wah effects at the same time in the FX1–4 blocks (FX1–3 blocks on the GT-1000CORE).
This changes the filtering over a periodic cycle, providing an automatic wah effect. -
TOUCH WAH: You can use multiple wah effects at the same time in the FX1–4 blocks (FX1–3 blocks on the GT-1000CORE).
You can produce a wah effect with the filter changing in response to the guitar or bass guitar level.