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SPA (Grandpa Expander) (Wood)

SPA (Grandpa Expander) (Wood)

Grandpa Expander

Spa is an expander for the granular sample module Grandpa. It adds CV inputs for nearly all parameters and a clock input to trigger grain shift. It doesn't work without the Grandpa eurorack module.

More CV inputs and a clock input to trigger grain shift

The voltage on the CV inputs is relatively added to the Grandpa's settings on both channels, A and B. All CV inputs react only to positive voltages. The update rate of these CV inputs is 20Hz. Communication between SPA and Grandpa can introduce audible artefacts to some samples while tweaking the SPA knobs.

Four CV inputs have attenuator knobs. These CV inputs are normalised to 5V so the knobs act as a signal source when nothing is connected to the CV input.


•           Independent CV inputs for most parameters of the Grandpa module

•           CV inputs with attenuators are normalised to 5V so the attenuators work as direct controls of the parameters for both channels A and B of the Grandpa

•           CV inputs react only to positive voltages from 0-12V

•           Grain size and shift speed CV inputs with attenuators

•           Switch to select whether the other two CV inputs with attenuators control Start / End or Attack / Release parameters

•           Crush CV input

•           Grain sync input to trigger grain shift

•           Handmade by Bastl Instruments in Brno, Czech Republic


Max Depth:50mm
Connector:PTC fuse and diode protected 10 pin power

Connects to Grandpa with a ribbon cable on the back panel
Power:+12V: 25mA

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  • Manufacturer: Bastl Instruments
  • Product Code: SPA (Grandpa Expander) (Wood)
  • Availability: 2
  • £75.00
  • Exc VAT: £62.50


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