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doepfer System A - 100Analog / Trigger SequencerA-155

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1. Introduction

Module A-155(Analog / Trigger Sequencer) is a com-

bined 8-stepanalog and trigger sequencer: it can

simultaneously produce sequences of analog voltages

and trigger and/or gate signals.

Module A-155 works very much like the Clock Sequen-

cer module, A-161, but includes many extra (and

expensive to implement!) functions.

The control section includes switches for Start, Stop,

Step and Reset - which can be operated by push-

buttonas well as digital signals. Above the top row,

eight LEDsshow the progress of the sequence, with

each step’s LED lighting in turn.

The A-155 has two analog rows, each witheight

knobs, with which to set the control voltage for each

step. The upper row is particularly designed for pitch

control of a VCO, with a range switch giving the ability

to set pitches precisely.

The lower row of eight knobs has the ability to accept

an external signal for each step, in which case the

knobs act as attenuators for this voltage.

The variable voltages from the analog rows can either

be output direct, or can go through a sample-and-

hold section and a slew limiter (‘glide’). Using the

S&H and glide control inputs, it’s possible to select

‘hold’ (S&H) or portamento (glide)for whichever step

or steps you want.

Three rowsof triggers and one row of gatesare

available. For each step, a three-way mini-switch lets

you decide whether one or the other (or neither) of the

two triggers works. Each row has an LED which lights

whenever a trigger or gate is active at any particular

step.

Produktspecifikationer