13
V-AMP PRO
8. INSTALLATION
The digital outputs are on a cinch jack (S/PDIF) or XLR
connector. The BNC jack is used to feed in external word clock
signals.
Fig. 8.1: XLR connectors
Fig. 8.2: 1/4" mono plug
Fig. 8.3: 1/4" stereo plug
Fig. 8.4: Stereo headphones 1/4" plug
8.4 MIDI connections
The MIDI standard (
M
usical
I
nstruments
D
igital
I
nterface) was
developed in the early 80s to enable different makes of electronic
instruments to communicate with each other. Over the years the
range of MIDI applications has constantly expanded, and today
it is standard practice to network entire recording studios using
the MIDI standard.
The heart of such a network is a computer with sequencer
software that controls not only all the keyboards but also effects
and other peripheral devices. In such a studio set-up you can
control the V-AMP PRO in real time from a computer. For live
performances in particular, you can also use a MIDI foot controller
to control both effect parameters and preset changes on your
V-AMP PRO.
The MIDI connectors on your V-AMP PRO are international-
standard 5-pin DIN jacks. To connect your V-AMP PRO to other
MIDI equipment you will need dedicated MIDI cables. They are
commercially available in various standard lengths.
MIDI IN: receives MIDI controller data. The receiving channel
can be adjusted in EDIT mode by pressing the A button and then
using the arrow keys.
MIDI OUT/THRU: used for sending data to a computer or any
other devices. You can transmit both preset data and parameter
changes. If set to MIDI THRU, the V-AMP PRO does not send its
own MIDI information, but passes on the signal received at the
MIDI IN jack.
8.4.1 Sending/receiving MIDI-Sysex data
The V-AMP PRO can receive system-exclusive data from other
MIDI devices provided that the MIDI function (button A) has been
activated in EDIT mode. However, this means that all presets on
the V-AMP PRO will be overwritten automatically. You can also
transmit MIDI data from your V-AMP PRO to other devices (total
dump) by switching to EDIT mode and pressing the MIDI button
until the display reads d. The total dump function can be useful
for transferring all the stored data from your V-AMP PRO to a
MIDI sequencer and storing it there.
To send individual presets to other devices: switch to EDIT
mode by pressing both arrow keys on the transmitting unit
simultaneously, activate the MIDI function and briefly tap the MIDI
button. The preset data are first filed in the temporary buffer and
can be stored in the preset position of your choice using the
store function.
8.5 AES/EBU and S/PDIF standards
In principle, there are two standards for digital signal
processing. AES/EBU is the professional, balanced connection
via XLR connectors. This interface is based on two identical
protocols published in November 1985 (EBU Tech. 3250-E) by
the
E
uropean
B
roadcast
U
nion and in December 1985 by the
A
udio
E
ngineering
S
ociety (AES3-1985). Sony and Philips
oriented themselves to this standard and developed a further
interface with unbalanced signal routing and a few other major
differences, predominantly related to the assignment of the
channel status bits. This interface, named after the two com-
panies and known as S/PDIF (Sony/Philips Digital Interface),
uses either cinch jacks or optical connections with optical fiber
cables. The procedure, standardized in IEC 958, made a name
for itself mainly due to efforts to introduce a copy-protect
technique. This standard also describes the revised AES/EBU
interface, which was adapted to the S/PDIF format and named
IEC 958 Type I (professional). The name of the S/PDIF interface
is then IEC 958 Type II (consumer).
