0% up to 48 Months on over 110 Brands!

New & Current Vintage King Card Holders

$ 616 .00
No interest if paid in full within 12 months Learn more
Special Order
Note: This item may not be returnable or could require a restocking fee. Contact one of our Audio Consultants for more details. Due to the special nature of this item, we order each unit fresh from the factory, exclusively for you! Lead times may vary so please chat, call or email for up-to-date inventory status.



Doepfer A-157 Trigger Sequencer Subsystem

8-channel, 16-step-button Eurorack step sequencer module with breakout modules and 20-pin ribbon cables - 52HP
MFR# A-157-1/2

Product Description

The Doepfer A-157 Trigger Sequencer Subsystem is a trigger sequencer subsystem that generates eight trigger signals controlled by a 8x16 LED/button matrix (some customers call it "Miniature Schaltwerk" as it is based on the same matrix as the no longer available Schaltwerk). The subsystem contains three modules:

  • A-157-1: 8 x 16 LED/button matrix and function addressing buttons/LEDs
  • A-157-2: Trigger Output module
  • A-157-3: Control Inputs module

The LED/button matrix module A-157-1 is the core of the subsystem. It is used to set or reset the trigger event on each of the 16 steps of each of the 8 rows. In addition the buttons and LEDs of the matrix are used for other functions too (like setting the first and last step of each row or addressing the preset memory).

The Trigger Output module A-157-2 outputs the 8 trigger signals and has an LED display for each trigger available.

The Control Inputs module A-157-3 has manual controls and trigger inputs available for the basic control functions start, stop, reset and clock. In addition four functions inputs are available which will be used in future firmware versions to assign these inputs to special functions (e.g. shifting a row left or right by means of an external gate/trigger signal or a second set of start, stop, reset and clock for individual rows).

The three modules are internally connected via ribbon cables and can be arranged also in another layout (e.g. A-157-2/3 on the right side of the A-157-1 or in a row above or below). The modules are available only as a complete set.


In addition to the main 8x16 matrix this modules contains also the buttons and LEDs for these functions:

  • Mute button for each row, these buttons are planned also as submenu buttons for future firmware version
  • Select button for each row, used to address one or more rows for subsequent functions (e.g. first step, last step, shift left, shift right ...)
  • Function buttons/LEDs, the functions are divided into two levels, the second level is invoked by the SHIFT button/LED on the buttom right position
  • The functions without SHIFT are printed black, the SHIFT-functions are printed in reverse
  • On the front plate there are already printed some texts for future/additional features/functions. Mainly in the SHIFT-plane


This is the trigger/gate output module that has 8 sockets with assigned LEDs available. The width of the output signal depends upon the width of the incoming clock signal, i.e. the width of the output signals is the same as the width of the incoming clock signal.

The level of the output signal is software controlled (i.e. not fixed to a certain value) as each outputs is equipped with a separate DAC (digital-to-analog converter). In the first version of the firmware the level is fixed to ?V.


This module is the master control unit for Start, Stop, Reset and Clock. In addition four function controls and inputs are available that will be used in future firmware versions to address certain functions also from external signals (e.g. shifting a row ). Each function has a manual operated button and a control input. The voltage at each input has to be +3 V... +12 V to trigger the function in question.

Product Specifications

Condition New
Depth 45 mm
Chassis Module
Module Type Eurorack
Module Slot Count 52hp
Connector Type 3.5 mm

Product Reviews

No one has written a review yet. Be the first!

* Required Fields

Share Your Opinion

The best gear advice always comes from those who use it the most. That's where you come in! Let the pro audio world hear your voice with a review of the Doepfer A-157 Trigger Sequencer Subsystem . Once you submit your review, please check your email and verify your address to have it posted.

How do you rate this product?
I would like to thank VK for the wonderful sales assistance, service and prices. This was my first purchase with you and it won't be my last. I only wish I'd discovered you years ago!
Matthew R.
I had two Grammy wins this year - Ray LaMontagne & Carolina Chocolate Drops. Both made with help from Vintage King!
Ryan F.
In almost 20 years in Pro audio buying, never did I receive a unit so well packed and exactly as described. Works flawlessly. The whole process has been so smooth. I will never hesitate to do business with you guys in the future and will recommend you to everyone I know.
Martin C.
This was my first experience buying something from Vintage King (although I surf the "used" categories on the website frequently!), and, despite being on the other side of the world, I had absolutely no trouble and everything went very smoothly.
Phil T.
The speed of delivery exceeded my expectations! I was VERY pleased that my shipment arrived in time for a scheduled vocal tracking session. The packing insured that my order arrived safely. And the sales staff responded quickly to questions regarding the product.
James P.
Thank you so much! Vintage King has been so fair and easy to work with. I can't thank you enough. It feels good to trust such a hefty purchase to folks who are so helpful and knowledgeable. Vintage King is a sound designers dream store.
Noa L.
You guys have excellent customer service and I am excited about the next upgrade I complete on my fifth recording facility. I've been in the studio business for forty plus years. The salesman I worked with at Vintage King was the best of the best. You all rock!
Robby T.
I would recommend Vintage King to any one looking for top-class gear, unbeatable customer service and the best prices on the map!
Jake D.
My experience with Vintage King was excellent. The order was here fast considering it was out of stock. The sales person had SKB send it to me directly and I couldn't have been more pleased.
Michael D.
From the minute I placed my order I was kept well-informed through each step in your process. Even though I was buying a comparatively modest piece of gear, your attention to detail made me feel like I was purchasing a six-figure mixing desk.
Thomas W.
I am a new customer of yours. You guys provided me the absolute best deals in ordering all the equipment to power my brand new recording studio. Your customer service is amazing and i will always deal with you from here on out.
Rob M.
Thanks for your great service and getting this out today. You guys really are the Kings!
Alan B.
Better than expected! Truly impeccable service. Your team was professional, knowledgeable, provided speedy delivery above and beyond standard. Vintage King Audio is definitely my go to for all of my audio and information needs.
James O.