Crum Drum

Unleash organic rhythms with randomness, probability, and vintage character.

Crum Drum is a four‑voice drum machine kit (Kick, Snare, HiHat, Bass‑FM) with built‑in randomization and probability‑based sequencing. Designed by NYSTRÖM, it sparks creativity with internal random sequencer, MIDI/USB control, and analog‑clock sync. Press the Beat button to generate new patterns—adjust Probability for evolving grooves and Randomness for parameter modulation that keeps every performance alive .

Eight dedicated knobs let you sculpt each voice’s tone, and four powerful global effects—Overdrive, Reverb, Delay (tempo‑synced), and Swing—bring polish and punch .

Key Features

• 4 Voices: Kick, Snare, HiHat, Bass (FM)

• 8 Parameters per Voice: Volume, Pitch, Decay, Filter, Tone/Type, Probability, Randomness

• Global Effects: Overdrive, Reverb, Delay (tempo-sync), Swing

• Sequencing: Random+probability engine, MIDI/USB out, analog/MIDI clock sync

• DIY Kit: Through‑hole assembly, medium difficulty, includes all parts (THT‑only)

• Size: 145 × 125 × 42 mm; Panel: Blue FR4

• Power: Micro‑USB 5 V DC

Technical Specifications

• Depth: 125 mm, Height: 42 mm, Width: 145 mm

• Power Input: 5 V DC via Micro‑USB

• DIY Skill Level: Medium / THT only

Applications

• Idea machine for beats and melodies

• Live performance with dynamic and evolving patterns

• Generative sequencing, experimental music, and groove creation

• DIY synth enthusiasts building kit from scratch