USER MANUAL

( Ver 1.0 )

Features

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Programmable All-analog VCA 　 (Voltage Controlled Amplifier) circuit

128 steps audio volume control

128 presets respond to MIDI Program Change Messages

Discrete volume change responds to MIDI Continuous Controller

Values

Instrument / Line audio level switch

Three character LCD display for easy viewing of the audio level

30 clicks rotary encoder(/w switch) for easy changing of the value

Powered by regulated 12V DC (approx. 60mA)

Aluminium enclosure 125 W x 80 D x 60 H (mm)

Weight : 250 g

Description

INPUT

OUTPUT

: This is an input jack for guitar or external audio signal.

: This is an output jack for an audio signal. Connect

MIDI IN to your amplifier or other external device.

: This is a 5-Pin DIN jack that allows the MVC to receive MIDI commands from an external MIDI device.

: This is a 5-Pin DIN jack that passes MIDI commands MIDI THRU to received by MIDI IN jack to other MIDI devices.

LEVEL SWITCH : This switch is provides selection for the rate input

POWER

DISPLAY

VALUE level (Instrument / Line).

: This is a standard 5.5mm/2.1mm

barrel jack.

Regulated 12VDC, 60mA (can use in Voodoo Lab

Pedal Power ACA mode)

: This LCD displays the volume control (0 - 127) or

MIDI channel (1 - 16).

: By rotating the knob, you can modify an volume control or MIDI channel. By pressing th knob, you can store a volume control or MIDI channel.

Operation

The MVC utilizes two modes of operation, Program Change mode and

Continuous Controller mode .

On power-up, the display will show 127, the volume control output is unit gain.

Note : On the display, 127 is unit gain (0dB)

Program Change mode

When a MIDI Program Change message is received on the same MIDI

Channel as the MVC, the MVC will automatically recall the stored volume control data in the memory.

1. Using your MIDI footcontroller, select a preset that will transmit a MIDI

Program Change message to the MVC.

2. Rotate the value knob to edit a volume control from 0 through 127.

The display back-light will be flashing.

3. Press the Value knob to store a volume control in the memory. The display back-light will stop flashing

Simply repeat the above three steps to create more presets for other

MIDI Program Change messages.

Continuous Controller mode

The MVC responds the MIDI Continuous Controller messages.

The Controller number is 007.

In the Continuous Controller mode, a volume control is a received MIDI

Control Value (0 - 127).

Edit MIDI Channel

1. Apply power while pressing and holding the value knob. The display will show the present MIDI channel.

2. Rotate the value knob to edit a MIDI channel from 0 through 16.

3. Press the Value knob to store a new MIDI channel in the memory.

The display back-light will stop flashing and the MVC will automatically restart.

Note : The Initial default setting is MIDI channel 1.

Change Operating Mode

1. Apply power while pressing and holding the value knob. The display will show the present MIDI channel.

2. Rotate the value knob to change the operating mode until the PC or

CC is shown on the display.

PC means Program Change mode.

CC means Continuous Controller mode.

3. Press the Value knob to change the operating mode. The display back-light will stop flashing and the MVC will automatically restart.

Note : The Initial default setting is PC (Program Change mode).

Specification (Ver 1.0)

Power Supply

Input Impedance

Output Impedance

: 12V DC (60mA)

: 1M ohm

: 2k ohm or greater load impedance

Input / Output level

THD + Noise

: Instrument (-10dBv), Line (0dBv)

: <0.02% (20 - 20kHz, 0dB attenuation)

Volume Control Range : -80dB - 0dB (0 - 127), audio taper

MIDI Channel : 1 - 16

MIDI Program Change : 1 - 128

MIDI Controller number : 7

MIDI Control Value : 0 - 127