Doepfer A-155 Analog/Trigger Sequencer Manuel d'utilisateur Page 4

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A-155
Analog / Trigger Sequencer
System A - 100
doepfer
4
3. Controls
1 Switches
The three-position toggle switches 1 are used to
select whether a particular step outputs a trigger signal
on its respective row.
Position of the upper switches:
up: trigger output on row 1 (Trig 1 output)
centre: no trigger output
down: trigger output on row 2 (Trig 2 output)
Position of the lower switches:
up: trigger output on row 3 (Trig 3 output)
centre: no trigger output
down: gate output on row 4 (Gate output)
The three upper rows produce triggers - each step that
is switched to a row will produce a short pulse like a
clock signal. The lowest row produces gates - the
signal remains "high" for the duration of the step (see
fig. 1 on the next page).
2 LEDs
The eight LEDs
2
show the sequence’s progress;
each LED lights when its respective step is active.
fig. 1: timing diagram for trigger and gate rows
3 Trig. Control
The four LEDs
3
are status indicators for the trigger
and gate rows. Each lights when a step is reached
which is switched to its own row.
Clock
Trig. 1
Gate
1 2
3
4
5 6 7
8
Trig. 1
Trig. 2
Trig. 3
Gate
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