Digitana SYNTHI VCS3 Poly MIDI-CV Manuel - Sayfa 2

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Instructions on using the VCS3 Poly Midi-CV Interface

This is a Poly Midi-CV unit designed to be used with a Synthi VCS3 mk2 with or without a

DK1/2 keyboard attached.

It is based around Marc Bareille's fantastic 3-channel microcontroller based Midi-CV

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

modules)

See details of Marc's unit at his website:- http://m.bareille.free.fr/mcv876/mcv876.html

The latest units I ship have the most recent firmware (v3.06) for the PIC18F2320

microcontroller which has faster better performance than the older models (based on a

PIC16F876 ).

Before Power On

With the VCS3 powered OFF plug in the male 8-pin cable into the rear 'keyboard' socket and

the 8-pin female plug into a DK1/2 keyboard if present. Note the unit will work with just the

main VCS3 console without the keyboard but then make sure the lower toggle switches are

set to CV1, CV2 and CV3. Now power on the VCS3. The Poly Midi unit is powered up when

the VCS3 is switched on.

You will see the green midi activity led flash and then go out, which indicates all is well.

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 blinks 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 midi-> cv

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

'squeezed' out of the micro-controller.

"MIDI Learn" switch

To place the unit in midi learn mode toggle the midi learn switch on then off (down and back

up). The midi activity led stays on until a MIDI message has been received and learned by the

interface. The led will blink 3 long blinks if the interface receives the "Write To Flash" sysex

message and will then automatically go out of midi learn mode to midi play mode.

If you wish to come out of midi learn mode without sending any new configuration data, just

toggle the midi learn switch down and up once more. Then the led will switch off and the

unit is in the standard play mode.

NB: the normal operating position for the midi learn toggle switch is in the 'up' position.