I often use the expression pedal to do slow synth sweeps rather than 'wah'. Typically I run the PS6 an Octave down into it and sweep the whole filter range. It's absolutely huge, especially with a bit of delay. Another thing I do is to run the PS6 either 1 or 2 octaves up and use the expression to fine tune the filter to the point where it almost sounds like a wind instrument. It gives me the option of 'playing' the filter or setting it and swelling the volume. I've not played with the sample rate control much - you can see how low I've got it set - but I haven't had it long. Malekko hit gold with this one. Looking at their website, they seem to be sold out - mine was ex-demo from Thomann. There weren't any for sale in the UK.