Introducing the T2K-VCF: an 8HP analog circuit adaptation of the lowpass/bandpass filter from an obscure 70s monosynth – the Powertran Transcendent 2000.
T2K-VCF is a 2-pole CA3080 OTA design w/ CA3140 op amp compensation at each stage. Translation = no loss of bass frequencies even at extreme resonance settings. Resonance will self-oscillate and produces a nice sine wave alone. T2K-VCF will fatten up routine oscillators - transform boring square/pulse and straight ramps into curvy vixens dressed to kill. Wavefolded material sounds phenomenal on this.
FREQUENCY | the initial Cutoff Frequency of the filter
RESONANCE | the depth of the peak frequency resonant feedback
IN1 & IN2 | Mix together 2 different audio signals, each w/ their own mix pot.
KB | Modulate the Cutoff Frequency w/ a V/oct signal or any other polar/bi-polar mod. Self-oscillation resonance will track v/oct loosely, but you will need to tweak the Initial Cutoff Frequency (Tune) and the KB amount knob (width tracking) to get there.
CV | Another Frequency mod can go here, range is greater than the KB input.
SHAPE | Select between LP lowpass or BP bandpass filter output w/ this mode switch.
OUT | the audio output jack of the filter
Includes a 10-pin to 16-pin Eurorack ribbon connector
Specs
8HP Module width
24 mm Module depth
14 mA on +12V
25 mA on -12V
0ma on 5V (not used)
The T2K-VCF pairs well with:
Wavefolders or VCO/wavefolders – Cre8Audio Capt’n Big-O, Dannysound Timbre
GSE 2xADSR – use envelope CV for some deep bass modulation
GSE Polychrome Phaser
Delay Effects – Happy Nerding FX Aid