Doepfer A-155

Analog-/ Trigger Sequencer

  • 2 Switch rows with 8 steps each
  • Eurorack format
  • Width: 50 HP
  • Depth: 40 mm
  • Power requirement: +80 mA (+ 12 V) / -20 mA (-12 V)
  • Optional expander module: Article Nr 192018 (not included, must be ordered as a separate item)
19 customer ratings:
  • 5
  • 4
  • 3
  • 2
  • 1
4.6 / 5.0
Text ratings for this product are available in another language only so far
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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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Great gameplay

Jörg6332, 11.06.2015
So a step sequencer is easy in any setup. Although there is unfortunately no Skip - but with the external CV / Audio Inputs level control of the second sequencer line is more than compensated. This is a great gameplay for extraordinary experiments.
Such a sequencer itself, of course, does not produce a sound - but it would be stupid if the rating would suffer. That's why there are full scores - after all, you create completely new sounds with its modules in the interplay with the sequencer.
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