2009-05-01 by JH.
(Preliminary) Schematics published
The 36dB/Oct LPF / Phaser:
http://www.jhaible.de/varislope_filter_phaser/varislope_filter_phaser_sch1.pdf
The LFO with crossfaded Waveforms, S&H and Audio Rate Modulation:
http://www.jhaible.de/varislope_filter_phaser/varislope_filter_phaser_sch2.pdf
Project Page:
http://www.jhaible.de/varislope_filter_phaser/varislope_filter_phaser.html
JH.