DualTwin Quad State Variable Filter

Aulos DualTwin

The DualTwin from Aulos is a two channel, four VCF module designed by Bert Vermeulen of Synton / Fénix. Arranged into two pairs of two filters, each with an independent Freq and Res, you will be subsumed in a world of stereo filtered delight. Three options are available to both pair: BP–BP, BP–LP, and inverted-LP–LP. Work in true stereo for wide spatialization or use the normalization to process a mono signal with the utmost precision. An In-All input lets you send a signal to all 4 of the filters for robust processing options, or use the B123L4 output for a network of 3 band pass filters and a low pass, for working with the widest array of frequencies.

Not satisfied with just being a filter, each pair can work as a stereo VCA as well. Patch you favorite envelope or modulation signal into the VCA jack and you have a robust dynamic processor. When unpatched, the filters stay wide-open. Designed for the modular enthusiast who needs to sculpt sound with precision, the DualTwin from Aulos is gorgeous sonic tool for your rack.

DualTwin Features

• 4-channel voltage-controlled State Variable Filter module arranged as two configurable dual-filter pairs
• Flexible routing switches supporting Band pass-to-Band pass, Band pass-to-Low pass, and Inverted Low pass-to-Low pass modes
• Dedicated audio inputs with intelligent normalization (In1 to In2, In3 to In4) plus a master In-All input
• Cutoff frequency CV inputs with channel normalization and master CV-All frequency modulation
• Individual resonance CV inputs capable of self-oscillation at higher settings
• Dual output stages with integrated VCAs that remain fully open when unpatched
• Composite Out-All output providing a direct mix of all four filter paths