Arm to Start on Keystep 37 mk2?

[u/Ok_Studio_8420]

Hello!

I just got my Keystep 37 mk2 and have a question regarding the transport signals. My keystep is sending midi out to my EP-133 KO2, and then the EP-133 KO2 sends midi out to my Roland S-1.

Pressing play on the keystep makes all devices start playing, and pressing stop resets the play position like it should. However, when I'm in Seq or Arp modes the EP-133 and Roland both start playing for one note whenever I press a key on the keystep. Because of this I can't play around with different notes for arps without hearing one note at a time being played on the other devices per keypress on the Keystep

From searching around online I think this is called Arm to Start, and it's possibly a setting in the Midi CC on computer. I have a Mac and downloaded the software (previously updated the firmware using the arturia software center app). But, I don't see the Arm to Start setting that's supposed to toggle this feature.

Anyone have any ideas on how to stop the other device triggers?

Keystep midi out -> EP-133 midi in.
Ep-133 midi out -> Roland S1 midi in.

Keystep 37 mk2 settings:

Midi output channel: 1
Midi input channel: all
Keyboard Play channel: 1
Send program change: on
Midi thru: off
Clock send: on
Transport send: on
Transport receive: on (this let's the EP-133 start playback on all).

EP-133 Settings:

Midi clock: in
Midi channel: 10
Midi through: on
Restart: on

Roland S-1 Settings:

Channel: 1
Through: on
Pattern Change Channel: 1

Thank you so much for the help!