He did the very promising and now open source, Monowave II for the DSP based Chameleon platform. He also made a polyphonic version of the Monowave for this platform called Phoenix. Both of his DSP based projects included a unique filter slope parameter to mix the output after the first pole and the fourth pole. Thus giving a 2 pole (=12 dB/octave) bandpass. very much like the Oberheim filters. But with the character of the Moog ladder filter. But due to the break-down of the Chameleon hardware builder in Spain, he stopped work on this.
For a few years Paul quit all activities on synth building and playing. He started to play electric bass in a band.
In 2009 Paul started to build electronic music projects again, the first of these was GorF a simple 8 step sequencer under the brand name of VacoLoco. Since then he has produced several other projects, including Tron a small drum pattern programmer and Zira a small monosynth based on the Korg NJM2069AD VCF/VCA chip.
He also made music under several names like:
He now plays keyboards for a goth/alternative rock band called Her Dark Embrace (http://www.HerDarkEmbrace.com & http://facebook.com/HerDarkEmbrace). you can hear extracts of his own music here - http://vacoloco.net/mymusic/
Paul also runs a huge synth web project http://www.synth.net which allows synth users to upload music, videos, files and blogs for free.