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.
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The service manual includes the full schematic diagram, voltage test points, and component list (BOM). If you hear a high-pitched whine or the ribbon controller fails, this is the manual you need. Look for the "124" designation on the PCB (Printed Circuit Board) near the power switch. The label is a lie
The Flash MonoTRON 124 is a portable, battery-powered analog ribbon synthesizer with a 124-millisecond to 124-second looper/delay and a chaos-friendly step sequencer. It looks like a calculator that had a seizure at a rave in 1982. Tuning: Use the VCO Pitch knob to tune the Monotron
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