Their Freedom Versions venture enlivened the walls with a graffiti mural among other endeavours, and its closing gig starred chamber-indie harmonists Quickbeam and alt-rock swashbuckler Withered Hand.

In the midst, flanked by the gaol and the gloaming, Glasgow-based duo Conquering Animal Sound unfurled a thrilling set of choral electronica, ambient rapture and local resonance. "Shout out to the Callander homeboys, otherwise known as my mum and dad," proclaimed machine-overlord and guitarist James Scott before playing tracks from forthcoming Chemikal Underground album, On Floating Bodies, the follow-up to their Scottish Album of the Year award shortlisted debut Kammerspiel. On this evidence, it is a hugely exciting prospect.