The HD300 does not seem to have a wah mix parameter so the intensity of the wah effect cannot be controlled.  For me this is the biggest weak point of the HD300.  I used to like using the wah pedals but on the HD300 the missing mix parameter has made me stop using this effect.  The fixed default mix value is too strong and I'd like to turn down the wah to get a less intense effect.

Any tips for working around this limitation?