The A-151 (Quad Sequential Switch) is an electronic, 4-stage rotary switch. It has a trigger input, a reset input, four input / outputs and a common output / input. Voltages in the range of -8V ... + 8V can be processed at the I/O or O/I connections. The module works - like the Dual-VCS A-150 - bidirectional, ie inputs and outputs are interchangeable. With each pulse at the trigger input, the common output / input is switched to the next input / output. After connecting to the fourth input / output, the common output / input is switched to the first input / output at the next trigger pulse (see Fig. 1). A positive pulse at the reset input switches the common output / input to the first input / output. Four LEDs indicate the active input (ie the one connected to the common output / input). Video: https://youtu.be/xCr2Tk5WvNIProduct Specs Item Number: 8389 Make: Doepfer Model: A-151 Condition: Brand New Finish: Silver Categories: keyboards-and-synths ⇒ eurorack Function: Switch Quad Made In: Germany MPN: A-151 EAN: 4250711115104 Modular Grid: Eurorack ⓘ + Dimensions*: 4 HP 35 mm deep Power*: 20 mA +12V 10 mA -12V 0 mA 5V * User contributed details