bastl-instruments/grandpa

GrandPA

Bastl Instruments

Granular mono sampler for Eurorack. Reads samples from a microSD card accessible from the front panel, runs the same sound core as the microGranny 2. Two trigger inputs for two different samples, CV input assignable to any sound parameter, 12-bit output.818

Capabilities 2

Granular Samplergranular-sampler
Plays wav files from microSD card with adjustable grain size, shift speed, sample rate, crush, attack, release, start and end position. Two independent channels (A and B), each triggerable separately.818
Granular Synthesisgranular-synthesis

Jacks 4 (3 in / 1 out)

NameSignalVoltageDescription
Inputs (3)
CVcv0V to 10VAssignable to any sound parameter. Can also be used to trigger grain shift (SYNC function). Reacts in 0–10V range.818
TRIGGER Atrigger818
TRIGGER Btrigger818
Outputs (1)
OUTPUTaudio818

Parameters 8

NameTypeRangeBehavior
DOWNbuttonSelects the previous sample from the microSD card. When held with PAGE button, changes the current preset.818
FNbuttonHold FN and move a knob to assign the CV input to that parameter. While FN is held, LEDs indicate SYNC and LOOP states.818
Knob 1knobFunction depends on current page: RED = sample rate, GREEN = grain size, BLUE = attack, WHITE = start position.818
Knob 2knobFunction depends on current page: RED = crush, GREEN = shift speed, BLUE = release, WHITE = end position.818
PAGEbuttonCycles through four pages indicated by RGB LED color: RED (sample rate/crush), GREEN (grain size/shift speed), BLUE (attack/release), WHITE (start/end).818
TRIGGER A ButtonbuttonManually triggers sample A.818
TRIGGER B ButtonbuttonManually triggers sample B.818
UPbuttonSelects the next sample from the microSD card. When held with PAGE button, changes the current preset.818

Firmware history 1 version

VersionReleasedNotes
1.1Updated firmware for all grandPAs from 2015 and earlier offering more features.818

References 2

  1. [818]
    Bastl GrandPA Manualmanual
    verified 2026-05-23
  2. [819]
    Bastl GrandPA product pageproduct_page
    ⚠ verified 2026-05-23 · manufacturer changed since last verified