Digitana VCS3 MKII Quad Midi-CV Manuale d'uso - Pagina 2

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Instructions on using the VCS3(mk2) Quad Midi-CV Interface

This is a Quad Midi-CV unit designed to be used with an EMS VCS3(mk2), either with or

without an EMS Dk1/2 keyboard or an EMS external Touch Keyboard Sequencer (KS). It is

based around Marc Bareille's fantastic 3-channel micro-controller based Midi-CV converter

called the 'MCV876' (which Marc has kindly allowed me to incorporate in the modules)

See details of Marc's unit and all its many features at his website:-

http://m.bareille.free.fr/mcv876/mcv876.html

The latest units I ship have the most recent firmware (v3.06 as of October 2010) for the

Pic18F2320 microcontroller which has faster better performance than the older models

(based on Pic16F876 microcontrollers).

Before Power On

With the VCS3 powered off, plug in the two grey cables with the 8 way 'Jones' plugs at each

end. The male Jones plug to the rear of the VCS3 'keyboard' socket, and the female to the

DK1/2 keyboard (if you have one). The Quad Midi CV unit allows independent switching

between a connected DK/KS keyboard and midi control, through front panel toggle

switches. Switch on the VCS3. You will see the green midi activity led (top left) flash a few

times to indicate all is well.

The midi-cv board in the Quad Midi is powered by tapping off the +12V/-9V from the VCS3

(via the Jones plug cables) but only a small current is drawn so that normal operation of the

VCS3(mk2) is unaffected.

PLEASE NOTE FOR A VCS3 (mk1) YOU SHOULD USE THE SPECIALLY DESIGNED QUAD MIDI

CV UNIT made for the mk1 and its weaker internal psu.

N.B. The toggle switch at top left IS NOT A POWER ON/OFF SWITCH! It is the Midi learn

switch (discussed below) and it should always be kept in the off (up) position in normal use.

The Quad Midi-CV unit has no on/off power switch. It is powered on/off when the VCS3 is

switched on/off.

The Midi Activity Led (green)

This is a multi-purpose led! The led blinks a few times at power on. Then the led will

monitor all incoming recognised MIDI status bytes. The led also blink 3 long blinks if the

interface receives the "Write To Flash" sysex message. When this message is received, all

MCV876 parameters are written into the flash RAM. So the MCV876 can recall a setup even

after a power off. When the interface is in MIDI Learn mode, the led stays on, until a MIDI

message has been received and learned by the interface. In 'mono' play mode (see play

modes description below) the mid activity led flashes when midi notes are received. In other

play modes it remains off when midi notes are sent..this is simply to speed up the mid->cv

conversion in polyphonic and multi play modes where every bit of processing speed is

'squeezed' out of the microcontroller.