PS...Dreamer, I know I'm probably asking too much (especially at the suggested price), but can you process a line in signal (i.e. from another synth) through the PX-5S's filters??
Ian,
as far as I know the signal coming from the line or audio inputs bypasses the filter section and goes directly to the Master Eq/Master Compressor section.
As for the other question, you can configure a pedal so that its on/off status causes a gradual increase or decrease of the sound volume.
You might also want to check these threads:
PX-5S in Canada Volume pedal What exactly is audio-in for?
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.