Dr. Octature

Introducing the intellijel Dr. Octature, another installment in the David G. Dixon 2164 series of modules.

The basis of the module is a 4-pole lpf inspired by the classic “cascaded ota” design, but realized instead with superior-quality 2164 vcas.

The “octature” refers to the 8 distinct, phase separated outputs (every 45 degrees, or two sets of four 180-degree shifted outputs). Each pair has a different slope: 6db, 12db, 18db and 24dB.

The cascaded-stage design is similar to the filter found in absolute classics such as the Roland Jupiter-6 and SH-101. However, when put into self-oscillation this filter becomes a stable, 1V/Oct tracking LFO/VCO, with each of the 8 outputs giving a sine wave 45 degrees out of phase with the next.

 

Features:

• coarse and fine tuning
• range switch for lfo (0.017Hz to 300Hz) and vco (17Hz to 22kHz) modes
• vc resonance with logarithmic response for smooth control
• 1v/oct temperature stable tracking
• mono/quad resonance gain distribution switch for classic or enhanced performance
• unipolar fm1 and bipolar fm2 attenuated CV inputs
• single pcb design (very shallow/skiff friendly)
• pin header on the back connects to a multimode filter expansion module – coming soon
• 14 HP