Bastl Instruments Skis


Dual decay + vca

Out of stock

SKU: BASL0007 Categories: , Brand:


In the front of every ski there is a curve similar to a decay envelope. Skis module has two channels A and B and each of them consists of a decay envelope with knob control and a VCA. There is a TRIGGER input to trigger the envelope, a buffered envelope output which is normalised to the CV input of the VCA. Than there is SIGNAL IN and OUT of the VCA.

There is also a CRUNCH switch which activates a special mosfet lo-fi VCA circuit inspired by designs of Standa Filip. This adds a slight crunchy character which changes with the decay of the envelope.

A typical application of Skis is to take two signals (noises for example) and generate drum sounds with adjustable DECAY from them with a TRIGGER signal. However, you can also use the two VCAs and two DECAY envelopes independently.


  • Dual decay envelope with adjustable decay time (trigger input, CV output)
  • Dual vca (signal IN, signal OUT, CV IN is normalized to CV output of decay envelope)
  • Crunch feature inspired by circuits of Standa Filip
  • Jumpers for changing the decay envelope to release envelope (vca is on full while there is a gate signal and than it decays)
  • Jumpers for enabling the decay knob to completely mute the decay envelope
  • Jumpers for selecting weird filtering of the output signal (also inspired by Standa Filip)
  • Front panel from oak wood, handmade custom knobs
  • Handmade in Brno, Czech republic

5 HP
+12: <30mA
-12: <20mA
35mm deep (skiff friendly)
PTC fuse and diode protected 10 pin power connector

Additional information

Weight 0.15 kg
Dimensions 16 × 11 × 5 cm