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S720 MIDI SWITCHER

STATIC OR MOMENTARY PROGRAMMABLE MODE

S720 is a multiple MIDI switcher that incorporates the functions of 5 pure switches
suitable for the ON/OFF management of remote control devices
(for example the change of amplifier channel, by-pass effects, step controls, etc.)
The switches can be set independently in three different modes:

1) STATIC
2) MOMENTARY A
3) MOMENTARY B

In the STATIC mode the switch works as a normal switch (ON/OFF):
the contact is ON when selected and OFF when deselected,
following the trend of its corresponding visualization led (RED).

In the MOMENTARY A mode the switch works as a switch (ON/ON): the contact is on when selected, only for approx. 50mS, then automatically goes to OFF.
The corresponding visualization led (GREEN) remains active to indicate the selection.

In the MOMENTARY B mode (yellow led) the switch works as in the A mode: the only difference is that the contact is ON in correspondence of the location access and then in correspondence of the output. This permits to utilize S720 to control the electronic by-pass devices (with push-button)
in the same way as for most of the NON TRUE BYPASS effect pedals.

S720 is managed via MIDI through a pedal board, a sequencer or a MIDI device able to send messages of program change according to MIDI standard.
It consists of one MIDI IN, one MIDI THRU, and thanks to the 7 poles connector,
it can be powered through phantom power.
Memorization on 128 memory locations (presets).
Programming of MIDI receiving channel (from 1 to 16) or OMNI.

It is possible to connect more than one S720, also combined with other MIDI devices,
through MIDI IN and MIDI THRU connections.

FRONT

The push buttons and the led on the front panel permit an easy programming of the device
on 128 memory locations.
It is possible to set, independently from each one of the 5 switches,
the STATIC or MOMENTARY mode (A or B).
The button MIDI CH starts the MIDI SETUP and it is possible, though the buttons A,B,C,D and OMNI
to choose the preferred receiving channel (from 1 to 16) or OMNI mode.

BACK

On the back, besides the 5 jack ¼” for the connection of the switches,
there is a SUB-D plug that re-proposes in parallel the connections of the 5 jacks:
it is useful when one or more switches must be connected with a sole multi polar cable.
S720 power is supplied by a network adapter 9V/500mA, through the coaxial plug of 2,5 mm.
MIDI IN and THRU plugs have 7 poles and supply the phantom.

MOMENTARY MODE "A"
This mode (green led) reproduces the behaviour of a push button, that is the behaviour
of a contact which closes for a second and then reopens.
A typical example is the control of a head amplifier with CLEAN/CRUNCH/LEAD having the pedal composed by three buttons, with annexed digital logic, working in exclusion (only a channel is active, pushing another button it is possible to exclude the previous one etc.).
With three switches of S720 set on MOMENTARY A
it is possible to control via MIDI the activation of 3 channels.
The contact is activated only once, when selected (green led on); pushing more times,
the contact does not repeat the operation unless the command is not coming from another preset.



MOMENTARY MODE "B"
This mode (yellow led) reproduces the behaviour of a push button as described in MODE A,
with the difference that the button is activated also in correspondence of the output of the preset.
This functions is necessary to control ON/ON push buttons.
The typical example is the management of a head amplifier when this one is controlled
through a key, with digital logic annexed.
A very interesting application of this functionality is the one combined
to pedal effects NON TRUEBYPASS, having analogical switch transistor with push-button control.
With a small change, easy and irreversible, it is possible to adapt most of these pedal effects to be utilized with S720 in order to manage the activation via MIDI.
To recognise the suitable models it is necessary to go through
the pedal box and be sure of switch button is used.
Generally on the push button there are two contacts from which two conductors
goes through the circuit.
Using a normal tester, go on these two contacts and, acting on the push button, verify that it is a momentary contact, that closes pushing the button and reopening releasing it.
At this point soft-solder two conductors, with a length sufficient to reach S720, exactly in parallel to the push button contacts.
Recognise an output way through the box, insert the two conductors, then close the pedal again.
Verify that the operation is ok turning on the pedal inserting the jack and making contact between the two conductors: the bypass must work and will be pointed out by the led.
At this point soft-solder the ends of the two conductors respectively at the edge and at the body of a jack connector 6,3”. Connect the jack to S720 and then verify the correct functioning.



Each one of the 5 switches consist of exchange contacts switches; in this way,
2 contacts are available for each switch:
normally open (NO) and normally closed (NC).
In order to reach the two contacts (NO and NC) it is necessary to use an external jack which ends in two mono jacks, as represented in the following pictures.
In order to utilize only one contact (NO) it is sufficient to have a normal mono jack cable.



There are some situations where, with one switch only, (static mode) it is possible to control two devices, for example two devices that must be activated exclusively
in a complementary way ( A=On, B=Off or A=Off, B=On).


Each contact of the 5 switches, besides being connected to the jack outputs,
is available also on a SUB-D 15 poles plug.
The contacts are reported in parallel and
the aim is to assemble in a sole connector all the connections.
The connections disposition does not refer to anyone of the existing standard,
so that it is necessary to realize the cable.
It could also refers only to a part of the contacts, observing the scheme aside.


S720, like LS42, belong to a series characterized by modularity and versatility, combined to RP2 RACKMOUNT,
an optional accessory available in Advancetubetech catalogue in a very near future.
Aside three possible assembling solutions are described:

A) single, on the floor, placed on the back of a rack, fixed on the back of an amplifier…

B) single, mounted with RP2; the empty section is closed by a rear panel
supplied in the package of RP2.

C) double, mounted with RP2.

Technical features

dimensions: 210 x 100 x 44
weight: g 650
power: 9Vcc 500mA / standard 2,5 mm coaxial plug
connections SWITCHES: standard mono/stereo jack 1/4"
Midi connections: standard 7 poles DIN

Owner manual, Mp3, Video