Polyphonic Keyboard Controller for Eurorack Synths
FVC - Four Voice Controller for Eurorack
5 Different Combinations
- FVC-1 Four Voice Controller Keyboard Logic
- FVC-EG1 ADSR/voice 0-5V output
- FVC-EG1+ ADSR/voice 0-10V output
- FVC-EG2 VCF ADSR/voice + LFO 0-5V output
- FVC-EG2+ VCF ADSR/voice + LFO 0-10V output
Features
All functions are controlled with CC numbers so you need a controller keyboard
5 Volt versions are suitable for Behringer Model D, Pro-1, Cat and K2
10 Volt version best for 2-XM but 5V version still a useable range
5 Volt versions are suitable for Behringer Model D, Pro-1, Cat and K2
10 Volt version best for 2-XM but 5V version still a useable range
FVC-1 - Basic Version
- Polyphonic control of 4 MIDI channels.
- Keyboard modes based on the original Oberheim FVS.
- 2,3 or 4 voice operation.
- MIDI IN and 2 unbuffered MIDI Outs (TYPE A MIDI Jacks).
- Continuous (Round Robin) or Reset.
- Split.
- Split Mode = Mono-L Poly-R or Poly-L Mono-R.
- Unison.
- Freeze.
- Faux Vibrato LFO (uses an offset via Pitch Bend message).
- (Thanks to Mo Thunderz for the LFO Library!! ).
- 4 Waveforms - Saw, Tri, Sin and Square.
- Adjustable Pitch Bend and Split Point.
- 64 Patch Memories - recalled with MIDI Program Change.
- Split, Pitch Bend range and LFO settings saved per patch.
You could add a 14HP panel using 4 standoffs - see the pictures below
You will also need 3 x Type A MIDI Cables (Befaco pack of 3 for £11.99 at Signal Sounds).
Please note this is not a commercial venture but contact me if you would like to build one.
FVC-EG1/2
As above plusADSR envelope per channel for VCA or VCF ADSR Output 0-5VADSR settings saved per patchParts: Additional 4 x Mono Mini Jacks, 4 x LEDS plus a few passive components
FVC-EG1/2 +
As above but ADSR Output 0-10VParts: Additional 2 x Op Amps and some passive components required for the Voltage Doubler
ADSR envelope per channel use for VCF VCF LFO with 4 waveformsVCF TrackingADSR Output 0-5VADSR + LFO settings saved per patch
Here is photo of a complete system using standoffs so you can add a 14HP cover to each one.
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The FVC1 is all you need if you just want the Keyboard Logic and faux Vibrato____________________________________________________________________________________
MIDI CC List
B = Button S=Slider
B16 - Pitch Bend On/Off voice 1
B17 - Pitch Bend On/Off voice 2
B18 - Pitch Bend On/Off voice 3
B19 - Pitch Bend On/Off voice 4
B24 - LEDS ON
B30 - Cont/Reset
B31 - Split
B32 - Split Mode
B33 - Poly/Unison
B34 - Freeze
B31 - Split
B32 - Split Mode
B33 - Poly/Unison
B34 - Freeze
B35 - Filter track Off/Half/Full
B37- Write Program
B37- Write Program
S40 - LFO1 Frequency
S42 - LFO1 Waveform
S44 - LFO2 Frequency
S45 - LFO2 Depth
S46 - LFO2 Waveform
S48 - No of voices 2-4
ADSR 1 -VCA
S53 - Attack
S53 - Attack
S54 - Decay
S55 - Sustain
S56 - Release
ADSR 2 -VCF
S57 - Mod Depth
S58 - Attack
S59 - Decay
S60 - Sustain
S61 - Release
Pitch Bend Range (can be set on the fly using the sustain pedal)
Sustain pedal is used to select Split Point on the fly.
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The basic version just needs a Pro Micro and a few components for MIDI in which can be easily mounted on the SIAM Modular prototype board. 10V versions need some op amps for voltage doubling. All power is supplied on 16 pin Eurorack header.
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