Zeptocore Handheld Open-Source Sampler

Ever dreamed of a pocket-sized sample mangler that feels like a secret weapon for beat battles? The Zeptocore takes handheld sampling to a new level, building on the Pikocore's charm with double the buttons for wilder sequencing and effects, all open-source and handmade in Seattle.

This tiny powerhouse—measuring just 4 x 2.25 x 1.5 inches—runs on two AAA batteries or USB-C, with a built-in 8-ohm speaker for instant playback. Load stereo 16-bit/44.1kHz samples via microSD (up to 8GB officially, though some report 32GB), organizing 16 banks of 16 tracks for 256 total slots. Switch between Jump mode to slice and loop samples on its 16 trigger buttons, Mash mode to toggle 16 effects like saturate, fuzz, delay, bit crush, reverse, or tape stop, and Bass mode for melodic lines. A real-time sequencer records button presses with optional quantization, supports chainable phrases, resampling, and sync via clock I/O or USB MIDI in/out. Button combos unlock extras like pitch/tempo/volume tweaks and single-cycle wavetable synthesis from your samples.

Players love its intuitive mashing for live glitch beats and breakcore, praising the sturdy build and deep customization via GitHub docs—though some note the unique sequencing (needing an extra press to set loop length) takes a quick jam to master.