Bastl Instruments Kastle Drum
Bastl Instruments Kastle Drum
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Bastl Instruments Kastle Drum

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A special edition of Bastl’s classic mini modular synth, the B Drum Kastle focuses 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 analogue clock, while retaining the triangle LFO for parameter modulation.

The Kastle Drum is a mini modular synthesiser 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 synthesiser 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
  • Dcceleration 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

Technical details

  • Dimensions: 70 x 60 x 50 mm
  • Powered by 3x AA battery or Micro USB.  

What’s in the box

  • Kastle synthesizer
  • 10 patch cables
  • Sticker


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