Eurorack Reference / modules /bastl-instruments/grandpa audit site v0.1 — milestone 3
bastl-instruments/grandpa

GrandPA

Bastl Instruments

Granular mono sampler for Eurorack. Reads .wav files from a front-panel microSD card, runs the microGranny 2.0 sound core. Two trigger inputs play two different samples; one CV input is assignable to any sound parameter or grain sync.187

Capabilities 1

Granular Samplergranular-sampler
Granular sampler based on microGranny 2.0 sound core; plays 22050 Hz 16-bit mono WAV files from microSD card with adjustable grain size, shift speed, sample rate, crush, attack, release, start/end position.187

Jacks 4 — 3 in / 1 out

NameSignalVoltageDescription
Inputs (3)
CVcv0V to 10V187
TRIGGER Atrigger—187
TRIGGER Btrigger—187
Outputs (1)
OUTPUTaudio—187

Parameters 6

NameTypeRangeBehavior
DOWNbutton—Selects the previous sample from the microSD card. When held with PAGE, goes to the previous preset.187
FNbutton—Hold FN and move a knob to assign the CV input to that parameter (indicated by a white flash). When FN is held, two LEDs show SYNC and LOOP states.187
PAGEbutton—Cycles through four pages indicated by RGB LED color: RED (sample rate/crush), GREEN (grain size/shift speed), BLUE (attack/release), WHITE (start/end).187
TRIGGER A buttonbutton—187
TRIGGER B buttonbutton—187
UPbutton—Selects the next sample from the microSD card. When held with PAGE, advances to the next preset.187

Firmware history 1 version

VersionReleasedNotes
1.1—Upgrade for all GrandPAs from 2015 and earlier, offering more features. Update pack available from the Bastl shop or local dealers.187

References 2

  1. [187]
    Bastl GrandPA Manualmanual
    source 187 canonical ↗ archived ↗
    ● verified 2026-05-06
  2. [188]
    Bastl GrandPA product pageproduct_page
    source 188 canonical ↗ archived ↗
    ⚠ verified 2026-05-06 · manufacturer changed since last verified