Halo Core distills Andy Timmons's signature Halo sound — a modulated dual echo where delay and reverb diffusion blur into each other, held together with tape-style modulation, saturation and compression — into a simpler, grab-and-go package than the full Halo Andy Timmons Dual Echo. Where the full Halo runs two independently programmable delay engines with five rhythm options and eight presets, Halo Core narrows this to two modes (Halo and Quarter Note) plus a dedicated tap tempo footswitch, keeping the core tone while cutting the menu-diving.

Main controls are Time (1ms–1,500ms), FDBK (repeats), Level and a Mode switch. The Tap/Hold footswitch sets tempo by tapping, or captures and sustains the current delay indefinitely when held — a redesigned Infinite Hold. Holding Tap/Hold while turning knobs unlocks secondary controls: a High Pass Filter (10Hz–300Hz) to keep repeats clean, a Tone control (1,500Hz–8,750Hz) for brighter or darker echoes, and Saturate for tape-style compression and grit on the repeats.

Power-up combinations handle factory reset, All-Wet/Wet+Dry switching and trails on/off. Bypass toggles between true and buffered (buffered by default) by holding the On/Off switch for two seconds. True stereo I/O and a TRS expression input round it out.

Runs on 9V DC centre-negative at 150mA. Pairs naturally with the Keeley Nocturne reverb — the two were effectively designed as a matched delay-and-reverb system for Andy's ambient sound in stereo.