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Doepfer A-155

Doepfer A-155

Analog and Trigger Sequencer for Modular System A-100

The following functions are available for the two analog rows (rotary knobs):

  • 8 Rotary potentiometers
  • Scale (stepless knob) on the lower row, 1V / 2V / 4V switch on the upper row
  • Glide (glide time knob = portamento, slew limiter)
  • Glide control (control input for switching glide function on/off)
  • S&H control (control input for controlling the internal S&H)
  • Pre glide/S&H out (analog output just off the S&H and glide unit, required when using the lower row with external audio signals)
  • Post glide/S&H out (analog output after S&H and glide unit)
  • On the lower row: External inputs for the 8 levels (switched jacks), here control signals or audio signals can be fed and the knobs of the lower row are working as attenuators

The four trigger rows (switches) have the following features:

  • 4 Trigger/Gate tracks with 2 rows of switches
  • Toggle switch with centre position, which can be either brought up, down or into the middle position (without function)
  • 3 Trigger rows (i.e. short pulse for each step set, pulse width corresponds to the pulse width of the clock signal)
  • 1 gate row (i.e. a signal is applied during the length of the step set)

Control inputs and buttons for:

  • Step (sets the tempo, synonymous with Clock, Trigger)
  • Reset (resets all rows to step 1)
  • Start (starts the sequence at the current position)
  • Stop (stops at current position)
  • Step and Reset are compatible with the MIDI interface A-190. In combination with the A-190, the A-155 may be synchronized with MIDI. The quantizing module A-156 can be used for precise quantization of the stepless analog outputs into exact semitone steps (measures of 1/12V). Without a MIDI connection, the rectangle output of an LFO can be used for tempo control.

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17 customer ratings:

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Total
handling
features
sound
quality

Small step sequencer almost naked ...

JEFF G., 08.07.2011
Description:

This is a Step Sequencer in Eurorack format.
This is an eight step, ie it can generate a sequence of eight events.
It has four trigger possibilities.
It generates two CV lines.
There are pre and post (CV) outputs depending on the Glide.
It has the basic functions, ie Start / stop / reset / clock.

Details of the main functions:

Trigger / Gate:

It has three Trigger outputs and one Gate output. The Gate output has a pulse longer than the Trigger.
The Trigger / Gate is activated via the two lines of eight switches.
Three positions per switch: On Trigger1 / Rien / On Trigger2.

Lines 1 and 2 are together and lines 3 and 4 are together.

This means that if the "pitch1" of Trigger 1 is activated, the "pitch1" of Trigger 2 can not be activated. Same for Trigger lines 3 and 4.

CV:

There are two lines of eight potentiometers. CVs can come pre or post Glide.
The CV1 line is designed to control the note pitch and the CV2 line to control, for example, the modulation of a filter.
Because of this, the CV1 line has a switch to manage the maximum pitch of the notes.
The line CV2 is almost identical ... except that there is not the note pitch switch and there is a CV output intensity potentiometer.
It can also be fully modulated by external sources like an LFO, for example.

Reviews & Comments:

A module that requires other modules.

This module can work almost alone, you will need at least something to generate a clock (an LFO, a BaR, a midi module with clock or gate ...)
To exploit it and draw a maximum, it will be necessary to add a module "Quantizeur" that will allow you to output notes "just".
To have more advanced functions, such as reading the random sequence, ping pong etc, it is necessary to add his control module (which, in passing, allows to put two A-155 in following and thus to make a sixteen steps. ..)

In the end, we can end up with the price of an external Step Sequencer, around 600/700 euros, but directly integrated into the modular.

It is perfect to create a sequence of eight "steps" relatively complex ... but only one!

Personally, I use it to create a bass line with a filter modulation (for example), to trigger my Kick on the Gate4 line and an OH (or other offset sound) on the Trigger 3.
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299 €
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item number 154958
sales unit 1 piece
available since January 2004
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