Chatting with ISTA’s vocalist-guitarist Rex Costello and bassist-vocalist Diona West in their home studio in New Jersey feels like being inside a Mark Rothko exhibition. The colorful acoustic panels in this space—butter yellow, tomato red, cucumber green, and multiple shades of blue—have the effect of the abstract artist’s color field paintings. The panels are inspired by ISTA producer Sam Cohen’s Slow Fawn Studio in upstate New York, where the band recorded their second album, the recently released In Sound to All —the spelled-out version of their acronymous name. This studio feels comfortable, if professional, with a bright yellow tambourine and thick coils of cords. But it’s also the married couple’s family home where they are raising two young children, a 3 1/2- and 1 1/2-year-old, alongside cultivating ISTA with their bandmates, keyboard player Chloe Golding, drummer Evan Eubanks, and guitarists Oliver Hart and Dan Rico.…