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.
Thanks! It took nearly a year of my spare time to get it to this, though. The Phat Philter Bank took about 3 months of that time!
By the way, I've also put the Phat Philter Bank guide up on the Casiobend website, so you can download it without having to join the Yahoo group as a member:
Be encouraged to know that I barely knew any of this stuff before I began it; help from kind people on forums such as this one and others steered me in the right direction on circuits and info, so that I eventually knew what to do before I even picked up a soldering iron to start on it. You might say I'm pretty chuffed with the people on this forum
Show us how you adaped it to the vtech when you're done he he!
You might need to add a separate on/off power switch for the filter - the vtech may not actually "switch off" completely when you hit the power off button, but just be in hibernation - like the Casio SK's. I flattened a few batteries with the filter still running after powering down because the part of the circuit I tapped into for the filter power still stayed on when you power the SK down, for memory retention etc.
Cheers
Graham
« Last Edit: January 20, 2008, 11:25:26 PM by gmeredith »
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