GrandPA & Spa

Digital Sampler + Expander

Combining the Granular Sampler with an Expander under a single aluminum panel.

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Granular Sampler

We have been asked by people to bring microGranny into the modular and we decided to rethink the whole granular sampler idea to fit it best into small size eurorack module. Grandpa is the result! It has 2 trigger inputs to trigger 2 different samples. CV input which is assignable to any sound parameter and signal OUTPUT. The CV input can be also used to trigger grain shift. Grandpa reads microSD card accessible from the front panel and runs the same sound core as microGranny 2. For each sample you can adjust: sample rate, crush, grain size, shift speed, attack, release (full release is hold), start and end position.

Features

granular sampler with microgranny 2.0 soundcore
plays wav files from the microSD card, 22050 Hz, 16 bit, mono
12bit output
adjustable sample rate (can go up to 44.1 kHz)
trigger inputs for playing 2 different samples with different settings
each trigger input has a button to do the trigger manually
RGB led to indicate page (on each page the two knobs adjust different parameters)
crush distortion
adjustable grain size and grain shift (positive or negative)
digital attack decay envelope
start and end point
no interpolation between grain jumps
each sample has adjustable destination of CV input – it can go to any of the parameters
grain sync – CV input can act as trigger input for triggering the grain shift
can recognize 35 different samples on the microSD card (they need to be specific name)
35 presets (all settings of the 2 samples is one preset)
CV input reacts in 0-10V range
handmade in Brno, Czech republic
front panel from oak wood, handmade custom knobs
breakout for FTDi USB adaptor for hacking, opensource firmware (see github)

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SPA (grandPa Expander)

Spa is an expander for the granular sampler module grandPa. It adds CV inputs for nearly all parameters and a clock input to trigger the grain shift. It doesn’t work without the grandPa Eurorack module.

The voltage on the CV inputs is relatively added to the grandPa settings on both channels A and B. All CV inputs react only to positive voltages. The update rate of these CV inputs is 20 Hz.

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.
Features

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