Flash Monotron 124 Manual May 2026

Technical Write-Up: Flash Monotron 124 Manual

Quick specs

Power: Internal rechargeable Li-ion 2000 mAh (USB-C)
Flash output: 124 GN (guide number) at ISO 100, 1 m
Recycle time: 0.8–2.5 s (depending on power level)
Flash durations: 1/2000s (high) to 1/200s (low)
Color temp: 5500 K ±150 K
Sync: High-speed sync up to 1/8000s; standard sync up to camera max X-sync 1/250s
Trigger: Hot shoe, 3.5 mm sync, optical slave
Controls: Power dial (0–100%), Mode switch (TTL/Manual/Multi), LCD status, Test button
Dimensions: 110 × 65 × 45 mm; Weight: 320 g

3.3 The Mono/Stutter Button

The label is a lie. It does not switch between mono and stereo (the device is mono only). According to the Flash Monotron 124 manual (translated from Mandarin): "Press to hold the current grain. Release to repeat." In practice, this button captures a 124-millisecond sample of the current audio and loops it at maximum speed while held. Release it, and the loop continues decaying for 2 seconds.

9. Factory Reset (Exile Mode)

Unplug everything. Remove batteries. Press and hold SEQ + Rand + Flash while inserting batteries backward for 1 second (yes, backward). Then insert correctly.
Unit will: flash monotron 124 manual

Flush all sequences
Set delay time to 124ms
Play one arpeggio of C major – then forget music theory

Chapter 4: How to Use the External Inputs

This is the single most misunderstood part of the device. The I/O section is poorly labeled. Technical Write-Up: Flash Monotron 124 Manual Quick specs

Input A (1/4" TS – "Line") : Actual impedance is 1M ohm. Works best with high-impedance sources. Passive guitar pickups will work, but you must crank the Guitar volume to 100%. The manual suggests using a distortion pedal before the Monotron 124 to boost signal. Power: Internal rechargeable Li-ion 2000 mAh (USB-C) Flash

Input B (3.5mm – "Mic") : This is not a microphone input. It is a control voltage (CV) input disguised as a mic jack. Plugging a 3.5mm cable from a Korg SQ-1 or Arturia Keystep into this port lets you sequence the pitch. Warning: The voltage range is 0-3.3V only. 5V will fry the chip.

Output : Always use the 1/4" output. The internal speaker cannot handle heavy bass and will physically rattle. The manual explicitly warns: "Speaker for demonstration only. For serious music, plug to amplifier."