The best replacement for wah pedal is whammy bar.

The best alternatives to wah pedal are rated as following:
★★★★★  whammy bar
★★★★  auto wah
★★  cry baby
★  whammy pedal

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Speaking about wah pedal, one probably shouldn't forget about bass.

Other search terms related to wah pedal and their ratings are:
★★★★★ bass
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wah pedal
whammy bar
auto wah