DOEPFER A-154 Manual - Page 9

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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.

System A - 100

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 7a is 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 7a is 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!

Sequencer Controller

A-154