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"The Erica Synths Black 3109 VCF/VCA is a lowpass filter and voltage-controlled amplifier combo built around the AS3109 VCF integrated circuit, a contemporary version of the IR3109 chip, found on vintage synths. Filters based on IR3109 had several drawbacks, including a volume drop when the resonance is increased so we added a volume drop compensation as well as a built-in VCA for more versatility in compact setups.
Timeline:
00:02 - Patch 1 - VCO through VCF which cutoff is modulated with the ASR envelope and sent through Black Hole DSP II
00:55 - Patch 2 - Basic waveforms from VCO through VCF with different resonance settings
02:13 - Patch 3 - Volume compensation test
02:50 - Patch 4 - VCO SUB out used as audio source of the VCF input and PULSE out from the VCO is used to modulate the VCF cutoff frequency. Black Hole DSP II stereo delay algorithm is used as FX
04:09 - Patch 5 - Creating bassdrum with self oscillating VCF which CV input is being modulated with ADSR envelope and then VCF output is sent through BH DSP II to add some overdrive and bitcrush
05:07 - Patch 6 - Stereo FM radio left channel sent through VCF and VCF cutoff modulated with the radio right output channel
05:35 - Patch 7 - Black VCO SUB mixed with PWM used as input for 3109 VCF linked with Black HP VCF using the VCF coupler module
07:27 - Patch 8 - Drum loop from Sample Drum sent through Pico E.F. and then trough VCF which is modulated with the CV contour which is extracted from the envelope follower
08:01 - Patch 9 - VCO sent through VCF which cutoff is modulated with ASR envelope and VCA part is controlled with second ASR envelope from the Black Dual ASR module. BH DSP II high pass delay algorithm is used as FX
All sequences in the demo are created with the Black Sequencer module."
"The Erica Synths Black 3109 VCF/VCA is a lowpass filter and voltage-controlled amplifier combo built around the AS3109 VCF integrated circuit, a contemporary version of the IR3109 chip, found on vintage Roland synths such as the Jupiter series, Juno series and the SH-101.
The 3109 VCF/VCA is our attempt to recreate the iconic sound of these synths, but we also aim to improve upon it. Filters based on IR3109 had several drawbacks, including a volume drop when the resonance is increased so we added a volume drop compensation as well as a built-in VCA for more versatility in compact setups. Additionally, 1V/oct tuning is implemented so you can use this module for perfect VCF keyboard tracking and also as a VCO.
Features
24dB/oct lowpass VCF
Volume drop compensation
Built-in VCA
Cutoff level attenuverter
1V/oct tracking"
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