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19    D-FCV MIX:

This control pans the D-FCV signal - to VCF 1 only (Control fully anti-clockwise) or VCF 2 

only (Control fully clockwise) or it can be panned and a mix of the signal is sent to both 

filters, with the signals being split equally between VCF 1 and VCF 2 when it is in the 12 

o’clock, mid way position.

20    D-FCV Input:

The D-FCV voltage can be either an internal or external control voltage,  for external 

control a CV  should be patched to the D-FCV jack (20), and when the patch cable is 

inserted the D-FCV Level control becomes an attenuator for the incoming CV signal.

With the D-FCV control fully clockwise the effective control range for the D-FCV control 

voltage is -10V to +10v, and the maximum permissable voltage to this input is -12V to 

+12V.

21    Dual Output:

The D-OUT is the output from the MIX BUS, which is where 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 other outputs on VCF 1 and VCF 2 are still active and available, however they are 

obviously individual to VCF 1 and VCF 2 and only a single filter will be heard when any of 

these are used.

22    MIX CV Input:

The cross-fading between VCF 1 and VCF 2 can be controlled with an external CV by 

patching a control voltage to this MIX CV jack. When the patch cable is inserted the 

AUDIO MIX control (15) then becomes an attenuator for the incoming CV signal.

With the AUDIO MIX control fully clockwise the effective control range for the MIX CV 

control voltage is 0 to +5V. Any negative voltages are seen as 0V and voltages higher than 

+5V are capped at +5V. The maximum permissable voltage to this input is -12V to +12V.

Description of Mixing Bus controls (cont.)

Controls mixing  and configuration of the two individual filters

(Cont.)

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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