Pittsburgh Modular structure 344, Руководство пользователя

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9. Utility Bridge Voltage Controlled Mixer Bus
Voltage Controlled Mixer Bus A and Voltage Controlled Mixer Bus B are functionally identical and will both be
covered by the following information. For clarity, references will be made to Bus A but the information applies
equally to the corresponding Bus B.
The Voltage Controlled Mixer Bus combines two main functions, a three channel mixer and a VCA but because
of the signal flow design, the available feature set of the Voltage Controlled Mixer Bus is very deep. The output of
the three channel mixer is sent through the VCA to the bus a outputs. The mixer and VCA be broken apart and
used simultaneously as several simple utility functions.
Mixer Features
The three channel mixer can be utilized for both audio and CV signals. The signal path of the mixer is extremely
flexible allowing it to function in four different configurations. Patching the output of Input 1 and/or Input 2 will
remove the Input(s) from the mixer circuit. This isolates the input channel creating a buffered attenuverter.
Input 1 (no signal patched in)
Input 1 is normaled to +5v allowing for adjustable DC offset. The Input 1 Attenuverter Knob (10) is used to adjust
this voltage anywhere from –
5 v (Input 1 knob full left) to 0v (Input 1 knob @ 12 o ’ clock) to +5v (Input 1 knob full
right). Patching into Output 1 (12) removes input 1 from the mixer creating a stand alone DC offset.
Input 1 (signal patched in)
If a signal is patched into input 1, the 5v normaling is removed and replaced by the patched signal. The Input 1
Attenuverter Knob (10) is used to attenuate and/or invert the input signal anywhere from full inversion (Input 1
Knob full left) to no signal (Input 1 Knob @ 12 o
’ clock) to full signal (Input 1 Knob full right). Patching into Output
1 (12) removes input 1 from the mixer creating a stand alone signal attenuverter.
Input 2
The Input 2 Attenuverter Knob (13) is used to attenuate and/or invert the input signal anywhere from full inversion
(Input 2 Knob full left) to no signal (Input 2 Knob @ 12 o
’ clock) to full signal (Input 2 Knob full right). Patching into
Output 2 (15) removes Input 2 from the mixer creating a stand alone signal attenuverter.
Input 3
The input 3 (17) is sent to the mixer at unity gain. Input 3 does not have a dedicated attenuator or attenuverter
knob to control the level.