4ms-stereo-triggered-sampler

4ms Stereo Triggered Sampler

Dual stereo sampler with recording, CV, and 600 samples

20 HP Eurorack module

The Stereo Triggered Sampler (STS) is a high-fidelity two-channel stereo audio recorder and playback module that can store up to 600 samples on a microSD card and play two different stereo files simultaneously. It offers deep CV control over pitch, start position, length, and sample selection, with on-board editing for loop/trim points, gain, and sample organization. Its musical character ranges from precise one-shot triggering and melodic 1V/oct playback to granular scrubbing, looping, and live recording of performances.

Features

  • Two independent stereo playback channels can play any of 600 samples simultaneously
  • Recording channel creates stereo WAV files directly onto microSD card for immediate use
  • Supports WAV files up to 96kHz/32-bit/stereo
  • Up to 600 samples loaded at once (10 per bank, 60 banks)
  • Intelligent file system: drag folders onto card to create banks, folders named with colors load into color banks
  • 1V/OCT pitch tracking with -10 to +4.3 octave range per channel
  • Start Pos CV and knob set loop start point (0-100% of file)
  • Length CV and knob set loop end point; under 50% applies percussive envelope; under 1% creates grains
  • Reverse button and trigger jack toggle forward/backward playback per channel
  • End Out jack fires +10V trigger on loop end, restart, or stop
  • On-board Edit mode: set loop/trim points via Scrub Start/End, adjust gain 10%-500%
  • Copy feature assigns same file to multiple slots with independent loop/gain settings

Controls & Jacks (51)

  • Length (Left)— Sets the loop/playback length for left channel; below 50% applies decay envelope
  • Sample (Right)— Selects which sample slot (1-10) to play on right channel
  • Start Pos. (Left)— Sets the starting point in the sample for left channel playback
  • Length (Right)— Sets the loop/playback length for right channel; below 50% applies decay envelope
  • Pitch (Left)— Sets playback pitch for left channel; ±4 octaves range
  • Start Pos. (Right)— Sets the starting point in the sample for right channel playback
  • Sample (Left)— Selects which sample slot (1-10) to play on left channel
  • Pitch (Right)— Sets playback pitch for right channel; ±4 octaves range
  • ▶ Play (Left)— Trigger input to start/restart left channel sample (>1.6V rising edge)
  • End Out (Left)— Outputs +10V trigger when left sample loops, restarts, or stops (13ms pulse typical)
  • OUT (R)— Right channel audio output; in stereo mode outputs right channels from both samples
  • Gain (Right)— Edit mode: adjusts sample gain from 10% to 500%
  • ▶ Play (Right)— Trigger input to start/restart right channel sample (>1.6V rising edge)
  • Length CV (Left)— CV input for left channel playback length (0V to +5V, adds to knob position)
  • PLAY (Left)— Starts/restarts left channel sample; hold 0.5s to toggle loop mode
  • Length CV (Right)— CV input for right channel playback length (0V to +5V, adds to knob position)
  • 1V/OCT (Left)— 1V/octave pitch CV for left channel (-5V to +5V range)
  • 1V/OCT (Right)— 1V/octave pitch CV for right channel (-5V to +5V range)
  • Bank (Left)— Cycles to next bank on left channel; hold Reverse+tap for previous bank
  • Start Pos CV (Left)— CV input for left channel start position (0V to +5V, adds to knob position)
  • End Out (Right)— Outputs +10V trigger when right sample loops, restarts, or stops (13ms pulse typical)
  • Reverse (Left)— Toggles reverse/forward playback on left channel
  • OUT (L)— Left channel audio output; in stereo mode outputs left channels from both samples
  • PLAY (Right)— Starts/restarts right channel sample; hold 0.5s to toggle loop mode
  • Start Pos CV (Right)— CV input for right channel start position (0V to +5V, adds to knob position)
  • ▶ Reverse (Left)— Trigger input to toggle reverse/forward on left channel
  • Reverse (Right)— Toggles reverse/forward playback on right channel
  • RECORD (Right)— Right channel audio input for stereo recording; mirrored to left if unpatched
  • RECORD (Left)— Left channel audio input for stereo recording
  • REC— Arms recording (hold 0.5s) and starts/stops recording
  • ▶ Reverse (Right)— Trigger input to toggle reverse/forward on right channel
  • Sample CV (Right)— CV input for right channel sample selection (0V to +5V, adds to knob position)
  • Sample CV (Left)— CV input for left channel sample selection (0V to +5V, adds to knob position)
  • ▶ Rec— Trigger input to start/stop recording
  • Sample
  • Bank (Right)— Cycles to next bank on right channel; hold Reverse+tap for previous bank
  • REC Bank— Selects which bank to record into
  • Next File
  • Monitor
  • Revert
  • JL
  • Scrub Start— Edit mode: sets trim/loop start point for right channel sample
  • Scrub End— Edit mode: sets trim/loop end point for right channel sample
  • Gain— Edit mode: adjusts sample gain from 10% to 500%
  • Sample (REC)— Selects which sample slot (1-10) to record into
  • Edit Sample— Enters edit mode for gain, loop/trim points, and sample assignment
  • Monitor LED— Blue LED that lights when monitoring is active (record input is routed to outputs)
  • Busy— LED that flashes when the SD card is being accessed for recording or reading
  • Reverse CV (Left)— Trigger input to toggle reverse/forward on left channel
  • Reverse CV (Right)— Trigger input to toggle reverse/forward on right channel
  • Rec CV— Trigger input to start/stop recording

How-To Guides

  • Save Sample Bank/Slot Assignments
  • Undo Changes to One Sample
  • Revert One Bank to Last Saved
  • Revert All Banks to Last Saved
  • Rebuild Index File (Factory Reset Organization)
  • Load WAV Files onto microSD Card
  • Record a New Sample to a Bank Slot
  • Basic Sample Loop
  • Granular Time-Stretching
  • Melodic Sequenced Sampler
  • Self-Clocking Ping-Pong Loop
  • STS as Master Clock Source

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

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