The AM1021 is a sequential switch, able to take the 3 outputs of the 1027 sequencer and combine them sequentially. Thus you can have up to 24 steps frrom the 3 x 8 sequences from the #arp2500 1027 #eurorack #module

It does this in very little hp space. The mix sequencer 1050 can also do that, but you can't use it for other functions, such as another sequencer or two or mixer. It gives the control row more flexibility. #modularsynth #sequencer #dawless #music

https://modulargrid.net/e/amsynths-am1021-sequential-clock

The main purpose of this auxiliary row of #eurorack #modules is to sequence notes CVs and modulation CVs for my 2600. S&H & LFOs are great for some modulations, but sometimes you need specific voltages in a specific sequence. Enter the #behringer #arp2500 1027 Clocked Sequential Control Module. It can sequence 3 different groups of up to 8 steps (position gates allows resetting the sequence at any step, although on all 3 sequences at once).

More than 8 steps? see next

https://modulargrid.net/e/behringer-1027-clocked-sequential-control-module

So what's on the other side? To go with a 2600, you know you want some sequencing goodness from the Arp 2500!

Note the external 16 pin power connector on the left side, in case I add an expander.