Now that I've finally finished my PHAT PHILTER BANK mod, here's how my SK8 looks with it installed, plus all my other mods!
The PHAT PHILTER BANK, for anyone who has been living under a rock the last month or so, is a true polyphonic VCF unit with CV input, cutoff and resonance, with envelope, LFO, external CV or manual control!
External CV inputs from a MIDI-CV box such as a Kenton box, to control the filter via MIDI, can be used to sequence the filter control remotely!
The SK8 also has an adjustable attack/decay on all presets/samples, as well as a whole stack of other mods like sample memory expansion, pitch bend wheel, LFO, MIDI input and multitimbral MIDI mode. There is also a separate drums VCF module.
The Phat Hilter Bank and also the single VCF drums module guides can be found at the Yahoo Casio SK group, in the FILES section of that site:
http://launch.groups.yahoo.com/group/CasioSK/Cheers, graham