4ms-sampler

4ms Sampler

High-fidelity stereo sampler with 600 slots and live recording

16 HP Eurorack module

The 4ms Sampler is a high-fidelity, single-channel stereo audio recorder and playback module that stores and retrieves up to 600 WAV samples from a microSD card organized into 60 color-coded banks of 10. It offers deep CV control over pitch, start position, loop length, sample selection, and bank, enabling everything from conventional sample triggering to granular scrubbing, time-stretching, and live recording directly into banks.

Features

  • Up to 600 samples loaded at once, organized as 60 banks of 10 samples each
  • Stereo WAV playback up to 96kHz / 32-bit
  • Stereo recording at 48kHz / 16-bit or 24-bit (96kHz in future firmware)
  • CV control over Pitch (1V/oct, -9 to +4 octaves), Start Position, Length, Sample selection, Bank
  • Trigger inputs for Play/Record, Reverse, and Bank
  • End Out jack fires trigger on sample loop, restart, or stop
  • Looping mode with crossfade/fade envelope for smooth loops
  • Percussive decay envelope when Length below 50%; attack envelope in Reverse
  • Granular-capable: tiny grain playback below 1% Length for scrubbing
  • Bank color organization system: 10 colors x 6 blink states = 60 banks
  • Intelligent file system: drag folders of WAV files onto card, each folder becomes a bank
  • Folders named with color names auto-load into that color bank

Controls & Jacks (41)

  • Play L— Triggers playback on the left channel. Press to start playing the selected sample from the start position.
  • Play R— Triggers playback on the right channel.
  • Bank L— Selects the sample bank for the left channel. Cycles through available banks (1-10).
  • Bank R— Selects the sample bank for the right channel.
  • Pitch L— Controls the playback pitch/speed for the left channel. Center position is normal speed, CCW slows down, CW speeds up.
  • Pitch R— Controls the playback pitch/speed for the right channel.
  • Sample L— Selects which sample within the current bank to play on the left channel. Scrolls through samples 1-10.
  • Sample R— Selects which sample within the current bank to play on the right channel.
  • Sample Select— CV/manual sample selection — central jack for selecting the active sample.
  • Start Pos. L— Sets the start position within the sample for the left channel. Determines where playback begins.
  • Start Pos. R— Sets the start position within the sample for the right channel.
  • REC Bank— Selects the recording bank. Determines which bank slot receives new recordings.
  • REC Sample— Selects the recording sample slot within the current bank.
  • Reverse L— Toggles reverse playback for the left channel. When active, samples play backwards from the end position.
  • Reverse R— Toggles reverse playback for the right channel.
  • Length L— Sets the playback length for the left channel, determining how much of the sample plays before stopping or looping.
  • Length R— Sets the playback length for the right channel.
  • REC Sample— Selects the recording sample slot within the current bank.
  • Next File LED— Indicates next file navigation activity for the left channel.
  • Revert LED— Indicates revert status for the right channel.
  • Monitor LED— Indicates recording monitor is active, passing input audio to the outputs.
  • Busy LED— Indicates the module is busy reading/writing to the SD card.
  • Record Left In— Left channel audio input for recording.
  • Record Right In— Right channel audio input for recording.
  • Out L— Left channel audio output for sample playback.
  • 1V/Oct L— 1V/Oct pitch input for the left channel, transposing playback chromatically.
  • 1V/Oct R— 1V/Oct pitch input for the right channel.
  • Out R— Right channel audio output for sample playback.
  • Rec Trig In— Trigger input to start/stop recording.
  • Play Trig L— Trigger input for left channel playback — starts sample playback on each trigger.
  • End Out L— End-of-sample trigger output for the left channel. Fires when playback reaches the end.
  • Reverse Trig L— Trigger input to toggle reverse playback on the left channel.
  • Reverse Trig R— Trigger input to toggle reverse playback on the right channel.
  • End Out R— End-of-sample trigger output for the right channel.
  • Play Trig R— Trigger input for right channel playback.
  • Length CV L— CV input for modulating the playback length of the left channel.
  • Start Pos CV L— CV input for modulating the start position of the left channel.
  • Sample CV L— CV input for selecting the sample on the left channel.
  • Sample CV R— CV input for selecting the sample on the right channel.
  • Start Pos CV R— CV input for modulating the start position of the right channel.
  • Length CV R— CV input for modulating the playback length of the right channel.

How-To Guides

  • Save Sample Slot Assignments and Fade Time
  • Record a New Sample to a Bank Slot
  • Load New Sample Bank from Computer
  • Update Firmware via Audio Bootloader
  • Rebuild or Clear the Sample Index File
  • Sequenced Multi-Timbral Drum Machine
  • Granular Time-Stretching
  • Ping-Pong Looping
  • Sampler as Master Clock Source
  • Shifting Loop with LFO
  • CV-Controlled Sample Slicer
  • Bounce Live Performance to New Sample

Explore the interactive Sampler panel on BleepDex — tap any control to learn what it does.

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