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In this patch we are using the Gemini in Dual Inverting Mode, so the Dual and Invert switches are both in the down position.

We are feeding the audio into IN 1, however do note that there is no patch cable in the IN 2 input - it is not needed as in DUAL 

mode IN 1 is normalised (connected) to IN 2 internally, so the single input is automatically patched to both VCF 1 and VCF 2.

Note that the Envelope OUT 1 is connected to a Multi, so that we can patch it to both FCV 1 and D-FCV inputs simultaneously 

- also, with the FCV control we have it set to -9, so it is applying a negative control voltage to the filter cutoff (because the FCV 

control is an attenuverter). But we are also routing this same envelope out CV to the D-FCV Input, and with the D-FCV Control 

set to 8 most of this voltage is passing through, because the D-FCV Control acts as an attenuator on external CV voltages and 

it is almost fully open.

We are taking the output from the D-OUT jack, so that we can cross fade between VCF 1 and VCF 2 using the Audio Mix 

control. As both VCF 1 and VCF 2 are set to Band Pass and have quite a large amount of resonance added we get some classic 

vowel sounds, and sweeping between the filters gives interesting tonal variation. Try different settings with the Invert Switch, 

D-FCV Mix and Freq 1, Freq 2 and FCV 1 controls to vary the sounds, and also try HP and Notch settings too for further 

variations.

Also, try controlling the Audio Mix by patching a second Envelope (or other control voltage source) to the MIX CV jack, and set 

the AUDIO MIX control fully clockwise to get the full range of control, just back it off a little if the CV voltage is peaking too 

high so that you get a full sweep from VCF 1 to VCF 2 

Note:  The numbers used to illustrate control knob positions do not relate to the markings on the module itself, but are simply a scale from zero to 10 with 5 
being the control centre position. For attenuverters the control positions are  -10 to +10, with zero being centre position for the control knob.

  

GEMINI 2412 - PATCHING EXAMPLES

10

10

Gate 1

Output 1

10

0

0

0

8

4

2

8

8

1

0

8

2

-9

0

7

5

0

5

5

  16’

0

0

BP

BP

DUAL

INV

7

0

0

0

0

0

0

2 - Dual Parallel VCF’s Inverting Mode, for Band Pass Vocal sounds

 Dual Parallel VCF’s Inverting Mode, for Band Pass Vocal sounds

1V/Oct IN 

Summary of Contents for Gemini 2412

Page 1: ...ix of VCF1 OUT 1 against VCF2 OUT 2 is controlled by the setting of the Audio Mix control with the output routed to the D OUT jack Dual Parallel INVERTED Mode this is the same as Dual mode however the...

Page 2: ...Cascade switch This connection is made using the internal switch on the IN 2 jack socket and is connected if no jack socket is connected but if a patch cable is insered into IN 2 then this connection...

Page 3: ...ance VCF 2 Frequency Vary 2 Control VCF 2 Mode Freq CV 2 Level INPUT 2 Level VCF 2 Output VCF 2 RES CV 1V Oct Input VCF 2 FCV IN VCF 2 Input VCF 2 LP Out VCF 2 BP Out VCF 2 HP Out 6 7 5 4 3 14 13 12 1...

Page 4: ...with this control setting so in this case it acts as a offset control 5 VCF MODE Switch This selects the filter type that is routed to the OUT jack 7 and to the central mixing bus 6 INPUT Level This i...

Page 5: ...rates from a VCO The accepted signal range is 5V to 5V Any voltages higher or lower than this will be capped to 5 or 5V Maximum permissible voltage to this input is 12V 13 BP Output This is the Band...

Page 6: ...cted in Dual Parallel or Cascade Series DUAL VCF 1 input is normalised to VCF 2 input so that the same signal is presented to both filters and the AUDIO MIX control 15 cross fades between the outputs...

Page 7: ...re the two VCF s are mixed together This is the only output that combines the mix of VCF 1 and VCF 2 so to use the DUAL CASCADED and DUAL INVERTED modes this jack must be used as the output All of the...

Page 8: ...f oscillation jumpers There are a few points to note about self oscillation mode 1 Because we have to force the circuitry into self oscillation the resulting signal level is quite high around 19V p p...

Page 9: ...ale buffer can be a useful addition if the self oscillation mode is used often and accurate 1V Octave scaling is required it allows scaling to be adjusted from the front panel without having to remove...

Page 10: ...of the Envelope CV so it will close down rather than open up the filter cutoff point The bass voice is fed to Gemini VCF 2 from the lower VCO This time on the Gemini we are using the OUT 2 jack and th...

Page 11: ...F 1 and VCF 2 are set to Band Pass and have quite a large amount of resonance added we get some classic vowel sounds and sweeping between the filters gives interesting tonal variation Try different se...

Page 12: ...D FCV Mix control at mid point so that the D FVC control signal is being sent equally to VCF 1 and VCF 2 We have also included a variant on this patch lower picture which shows the inverse output from...

Page 13: ...lockwise from zero to 10 fades between single 12dB LP configuration VCF 1 only and 24dB configuration VCF 1 and VCF 2 cascaded in series You will not that the 24dB setting sounds duller and less brigh...

Page 14: ...ired panning range We have also shown a dual envelope generator to control the cutoff of each filter individually obviously this is optional and and is shown as one of many modulation possibilities Pl...

Page 15: ...lly a Linear or Hybrid suppy Also there are a few Eurorack modules which are badly behaved and can introduce noise back onto onto the Eurorack power rails too the way to find these is to disconnect al...

Page 16: ...s then test tracking again E Scale 2 This trimmer adjusts the 1V Octave tracking of VCF 2 Turning it anti clockwise reduces shortens the scaling and turning clockwise increases scaling Note For use by...

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