SoundForce uVCF 6 Module (6HP)

Full Description

60/106-style voltage-controlled filter

Based on one of the most legendary filters ever created, SoundForce has meticulously recreated the original circuitry with a few modern innovations. The original filter sections were equipped with custom ICs which aided in its unique sound and musicality. These ICs were custom-made and are now obsolete. SoundForce has chosen the powerful LM13700 dual OTA IC (from Texas Instruments) to recreate the advanced shaping capabilities of the original filter section. Whilst staying true to the original, this module version has adapted and upgraded some components to deliver the best possible performance.

You can toggle between the two modes (4 poles – 24dB/octave, 2 poles – 12dB octave) in an instant by using the onboard switch. You can use the uVCF’s FM CV input to modulate the cutoff frequency of the filter – perfect for external manipulation and advanced sound design. The uVCF is also capable of self-resonance when the RES potentiometer is set around 4 o clock (or higher). The vOCT input can also be used to close the filter (based on the pith note of your CV source). There is also a Q CV input with a dedicated attenuator, as with the FM CV input.

Loudness drop compensation

Whilst staying true to the original, the uVCF also features a new addition to its design in the form of LDC. An issue found in the original filter section was that when the resonance was set at a high level, the filter section would incur a signal loudness drop. To combat this, SoundForce has incorporated this parameter in the form of a switch. When activated, the LDC function avoids the usual signal drop in loudness. For this to work, you will need to lower the input signal and/or VCA level to avoid any distortion, as the LDC process requires extra headroom.

Features

• Based on the filter section of an iconic vintage synthesizer
• 60/160-style voltage-controlled low pass filter
• Choose between 4 poles (24dB/octave) and 2 poles (12dB/octave) modes
• Ideal for sound shaping and sound design
• Meticulously recreated circuitry with improved and refined components
• FM and Q CV input – both with attenuators
• LDC (Loudness Drop Compensation) can be activated via onboard switch
• Can self-resonate when RES pot is at a certain position (around 4 o clock or higher)
• vOCT input can be used to close the filter (dependant on your CV source)

Specifications

• Module Size: 6HP
• Depth: 38mm (including power connector)
• Power: +12V 36mA, -12V 25mA
• V/OCT, FM (input range): -5 to 5V
• QCV (input range): 0V to 10V
• Product Code: SFC-uVCF6