Wah Lock 20/20.
This is Morley's most versatile Wah pedal. You of course have the classic switchless function, but you can also activate a Notch filter so that in practice you lock the sweep at any point, this is activated with a normal on-off switch
You also have what Morley calls WHOA on a separate on-off switch that changes the filter to better suit, for example, a bass.