Arroyo Seco was a short-lived band around 2002 that put out a 6-song demo tape with members later forming Life At These Speeds.
The sound is not comparable to Life At These Speeds though. I found a really accurate description somewhere in the webs:
"It’s really good. It’s got some Yaphet Kotto/Funeral Diner-life guitar harmonics, slow, melodic parts bitten hard by abrasive, loud mayhem, and multiple vocalists screaming their faces off – real emotional turmoil." [x]
So yeah, get into it cause the band was/is surely underrated.
Last from the Demo
02. Smoke Signals
03. Flow Through Me Pretty
04. The Last Five
05. My Favorite Funeral