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When used in AB mode (A, B, or Both), the Common Jack is
used to connect to the instrument and the A and B jacks are used
to connect to the two amplifiers. When used this way, then
output that is shut off is shorted to ground so there is no
noise coming from the unused amp. In this mode of operation, the
device can also be used to switch multiple instruments to one
amp, or in any other number of configurations.
When used as an Insert/Bypass, the
instrument is connected to the A jack, the amplifier or next
device is connected to the COM jack and the B/FX jack is
connected via a stereo to dual mono cord to the signal processor
that you are going to insert/bypass. The B/FX jack is actually
a stereo jack when used this way where the tip is wired to the
input of the processor and the ring is connected to the return
from the processor.
When used to select which of two signal
processors to route to your amp or the next processor the COM
jack is connected to the amp or next processor in the chain, and
the A and B/FX jacks are used to connect to the outputs of the
two signal processors. When used this way, the device that is
not selected looks into an open circuit to avoid loading on the
output of the unused device.
The B/FX Indicator
illuminates if the effect is inserted, or if the COM and B/FX
jack are actively connected. This indicator also blinks
momentarily when the unit receives a valid MIDI command that it
has acted upon to indicate a MIDI signal was recognized.
The Power Indicator lights when DC
power from the module is applied.
The MIDI In Jack connects to a
standard foot controller or the MIDI data stream.
The MIDI Thru Jack passes all MIDI
data through undisturbed.
The Power Jack connects to the supplied power module and
operates at 9V DC @ 100ma with the center pin positive. The ABCadabra measures approximately 5-1/2" X 3" X 1-1/2" in
size.
OPERATION The ABCadabra can be controlled either by MIDI Program Change
commands or by Control Change commands (Instant Access Switches) as are commonly
found in some modern foot controllers. Below shows how various Program numbers
control the device for each of the three functions.
Programs for A/B use:
|
Program |
Function |
| 0 |
Toggle A/B |
| 1 |
Cycles between
A, B, Both |
| 2 |
Toggles A |
| 3 |
Toggle B |
| 4 |
A ON, B OFF |
| 5 |
B ON, A OFF |
| 6 |
BOTH |
| 8 |
BOTH OFF |
| 8 |
A ON |
| 9 |
A OFF |
| 10 |
B ON |
| 11 |
B OFF |
Controllers for A/B use:
| CC # |
Value |
| 0 |
127 |
| 0 |
A=on
B=off |
A=off
B=on |
| 1 |
A=off |
A=on |
| 2 |
B off |
B=on |
Programs for Insert/Bypass effect:
| Program |
Function |
| 0 |
Toggle Insert/Bypass with bleed |
| 10 |
Toggle Insert/Bypass no bleed |
| 5 |
Insert |
| 4 |
Bypass no bleed |
| 6 |
Bypass with bleed |
Controllers for Insert/Bypass effect:
| CC # |
Value=0 |
Value=127 |
| 0 |
loop off (no bleed) |
loop on |
| 3 |
loof off (bleed) |
loop on |
Programs for selecting between two signal processors: Note that Program six
allows selection of both effects, but a special cable with series resistors must
be inserted to allow shorting outputs of processors together to allow such a
function.
| Program |
Function |
| 13 |
Toggle A/B |
| 14 |
Effect A only |
| 15 |
Effect B only |
| 6 |
Both Effects (must use external mix resistors) |
Controllers for selecting between two effects:
| Control Number |
Control value=0 |
Control value=127 |
| 0 |
A only, don't short B |
B only, don't short A |
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