doepfer System A - 100 Sequencer Controller A-154
9
Operating the reset button prepares the sequencer to
jump to the first step as soon as the next clock signal (!)
appears. If no clock signal is applied the reset button
seems not to work! We believe that it makes more
sense to carry out the jump to the first step not until the
next positive clock transition occurs. Otherwise the next
clock would cause an advance to step 2 (in forward
mode and first step =1). Especially for synchronous
operation of several sequencers this type of reset control
is more useful from our point of view.
Attention! In this detail the A-154 control differs from the
"old" A-155 control and from other sequencers. For the
A-155 the reset was independent from clock. Operating
the reset button caused to jump to step 1 independent
from the clock signal and the next clock caused an
advance to step 2.
Operating the clock button triggers an advantage to the
next step - provided that no clock signal is applied. As
the internal clock generator is normalled to the ext. clock
socket &d one has to insert a plug into the ext. clock
socket &d to interrupt the internal clock connection. This
can be used to take your time to adjust the control
settings of each step.
If an internal or external clock signal is applied the clock
button can be used to "gate" the clock manually, i.e. as
long as the clock button is operated the clock signal is
blocked and the sequencer does not advance to the
next step until the button is released.
7a 8/16 Steps (switch)
7b 9-16/A3 (LED) / / 1-8/9-16 (socket)
This group of elements is relevant only if two A-155 are
driven by the A-154. Switch 7ais used to switch bet-
ween parallel (8 steps) and serial operation (16 steps) of
the A-155. If only one A-155 is used the switch should be
set to position "8" unless you want to create special
effects (see below). Switch 7ais connected very closely
with the function of the address output A3 / 1-8/9-16.
The two A-155 driven by the A-154 always run in parallel
as the address signals A0, A1 and A2 are valid for both
A-155. To obtain sequences with more than 8 steps
another address signal A3 with valency 8 is generated
by the A-154. This signal is available at socket /
1-8/9-16 and is displayed with the LED 7b. This signal is
"low" for address range 1...8 and "high" for 9...16. As the
A-155 only "know" the addresses 1...8 a voltage control-
led switch A-150 is necessary to switch between the
corresponding outputs of the first and second A-155. For
this socket /has to be connected to the control input of
the A-150 and the outputs of the A-155 (e.g. the upper
CV outputs of the two A-155) with the inputs of the
A-150. The common output of the A-150 is the "new" CV
output as by means of the A3-controlled switching func-
tion of the A-150 a sequencer with 16 steps is
"emulated". The same procedure is valid for trigger and
gate rows. The new version of the A-150 (i.e. full swit-
ching range up to +12V) has to be used for gate/trigger!
