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