CASIO CZ-5000 - Signal Flow

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Explanation of the Patch generation possibilities.

What is a Line?

Every Patch consists of one or two dual-oscillator-filter-amplifier paths, called "Lines". Every item in the path has its own envelope generator. Both Lines can sound at the same time in a Patch, or they can modulate each other.

Line = DCO => DCW => DCA
Analog equivalent Oscillator   Filter   Amplifier
Envelope Generator modifies: Pitch   Waveform   Volume

This is a screenshot from the Casio CZ iPad app showing one Line. Programming a Patch like this is very easy, compared to the hardware synth button panel.

The 2 Lines can be in different configurations, in which they can have can different effects in relation to each other.

The 4 possible Line Selections are:
- 1st selection: [Line 1] = you hear only the sound of Line 1
- 2nd selection: [Line 2] = you hear only the sound of Line 2
- 3rd selection: [Line 1 + 2'] = Line 1 and a detuned version of Line 2 can affect each other
- 4th selection: [Line 1 + 1'] = Line 1 and a detuned version of the same Line can affect each other

The 1st and 2nd Line selection will sound the same regardless of the Detune or Modulation settings. This is because for Detune and Modulation you need to use two Lines, which can be a detuned version of same Line, or of the other Line. Detune is "always on", but can be set to zero (no detune). Only selection 3 and 4 can be affected by the Modulation settings. Fun starts here.


Detune and the 3 Modulation options

The amount of Detune can be set quite precisely: from zero (no Detune) to 3 octaves up or down. The amount can be set in octaves, in semi-tones and there's an extra fine tune. The Modulation options will only have effect on the 3rd [1+2'] or the 4th [1+1'] Line selection. When Detune is set to zero (=no Detune), there will still be a Modulation effect, because both Lines have a small offset (phase difference) to each other. Which is kinda cool.

You can select one of the 3 Modulation options:
- No Modulation

The signal flow for each Modulation

The Lines can be detuned.
- use Octave for the "sub oscillator" sound
- use Note for the "Fifth" sound effect,
- or use Fine for a "wave beating" sound effect.
When Detune is set to 0, both Lines will sound in the same key.

1 + 2' Line 1 -> MIXER OUTPUT: Line 1 + DETUNED Line 2
DETUNED Line 2 ->

1 + 1' Line 1 -> MIXER OUTPUT: Line 1 + DETUNED Line 1
DETUNED Line 1 ->

This option is great for the harsh DX7-like metallic sounds. In this mode:
- Line 1 is always the Modulator
- the Carrier is always a detuned Line.

1 + 2' Carrier: DETUNED Line 2 -> OUTPUT: MODULATED DETUNED Line 2
Modulate ^  
Modulator: Line 1  

1 + 1' Carrier: DETUNED Line 1 -> OUTPUT: MODULATED DETUNED Line 1
Modulate ^  
Modulator: Line 1  

This option is not a modulation in the strict sense, because nothing really is modulated, only the DCO of original Line 1 is switched to Noise and mixed with the other Line. This mode is can be used for drum emulation sounds.
In this Mode:
- the DCO wave of the non-Detuned version of Line 1 is replaced by Noise (Key Followed), the filter and the amplifier is unchanged.
- the Detuned Line consists of the original wave forms.

1 + 2' NOISE -> DCW1 >- DCA1 -> MIXER OUTPUT: (Noise) Line 1 + DETUNED Line 2
DETUNED Line 2 ->

1 + 1' NOISE -> DCW1 >- DCA1 -> MIXER OUTPUT: (Noise) Line 1 + DETUNED original Line 1
DETUNED Line 1 ->

OK, now go experiment!

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