Bastl – Kastle Drum – Full DIY Kit

£82.00 (Excl. VAT)

Mini Modular Glitch-Drummachine – Discover rhythm on a tiny patchable groovebox!

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SKU: Kit_BASTL_Kastle-DRUM Categories: , , Brand:


The Kastle Drum is a special edition of Bastl’s classic mini modular Kastle synth focusing on algorithmic industrial glitchy drums.

Drum sound synthesis with a unique dynamic acceleration charged envelope makes this rhythm box surprisingly versatile and extremely fun to play. The built-in VC clock generator with a stepped pattern sequencer can either run on its own or it can be synchronized to analog clock, while retaining the triangle LFO for parameter modulation.

The Kastle Drum is a mini modular synthesizer with a headphone output, 2 in/out ports for interfacing other gear, and it runs on just 3 AA batteries. It is ideal for beginners in modular synthesis, but it will add some quite unique functionality to any modular synthesizer system. It delivers the fun of modular synthesis at a low price and fits into your pocket so you can play it anywhere!


  • 8 drum synthesis styles
  • ”noises” output for less tonal content
  • DRUM selects drum sounds
  • acceleration charge dynamic envelope
  • decay time
  • PITCH control with offset and CV input with attenuator
  • voltage-controllable clock with square and triangle output
  • stepped voltage generator with random, 8 step and 16 step loop mode
  • 2 I/O CV ports that can be routed to any patch point
  • the main output can drive headphones
  • 3x AA battery operation or USB power selectable by a switch
  • open source
  • durable black & gold PCB enclosure


  • dimensions: 70 x 60 x 50 mm
  • powered by 3x AA battery or Micro USB
    Note: Kastle Drum may sound different when powered by AA batteries than when powered via USB due to the difference in voltages (5V on USB vs. 4.5V via AA batteries).

What’s in the box:

  • All kastle drum DIY kit parts
  • kastle drum PCB and acrylic enclosure
  • 10 patch cables
  • sticker
  • batteries not included

Kastle Drum – User Manual | Build Document

Additional information

Weight 0.106 kg

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