Chance And Randomness In A Eurorack Delay

US Tone Science Chance Delay is a collaboration between between Ian Boddy and AJH Synth      15/09/23

The Tone Science Chance Delay, a collaboration between between electronic musician/composer Ian Boddy and AJH Synth, is a unique concept in Eurorack modules as it combines chance and randomness with pulse delay and pulse conditioning. It can perform as a variable Chance generator, pulse stretching for Trigger to Gate conversion, pulse shortening for Gate to Trigger conversion, Gate Delay, Sub Bass Generation and also "divide by n" clock division. Here's more details firect from AJH Synth...

The firmware for the Chance Delay has been developed and coded by "Electric Druid" Tom Wiltshire, and lots of development time was spent perfecting the fast processing that allows it to work into the lower audio range.

There is a wide range of control and all functions can be operated manually from the front panel or can be automated using external CV voltages. Chance can range between 0 to 100%. The Gate out can be delayed by anywhere between from 0.5mS to 30 Seconds, and the output Pulse length can also vary from 0.5mS to 30 Seconds.

The TRIG push button allows manual triggering of pulses, also determined by the Chance control, and a green LED shows the output pulse status.

Includes a handy "Gate pass through" mode; when the Length control is set to zero the incoming pulse or trigger will still be determined by the Chance and Delay controls, whilst the outgoing gate length will be the same as the incoming gate length.

Compact 8hp form factor and very low power consumption make this an excellent addition to any Eurorack system.


  • Chance, Gate Delay time and Pulse Length can all be set manually or controlled using external CV voltages.
  • The 'TRIG' push button allows manual triggering, and Chance will be applied to any manual triggering too.
  • Fast processing allows operation into the lower audio range, so it can perform sub bass generation on drone type sounds. In this mode the Length pot (or an external Length CV) can be used to change the PWM of the output waveform.
  • After the initial trigger pulse has been acted on, further incoming pulses are ignored until the current cycle has finished. This useful feature allows it to perform "divide by n" division on gate pulses, so it can be used for clock division, and the delay function can be used to add a "swing" away from the rhythm.
  • Gate pass through mode - if the Length pot is set to zero, then the incoming gate length is preserved, so in this case the gate has Chance and Delay time applied to it, but the outgoing gate length is the same as the incoming gate length.
  • By setting Chance to 100% and Delay to zero (0.5mS) it can be used as a Gate to Trigger converter, or a Trigger to Gate converter, depending on the Pulse length set with the LENGTH control. We can also use an external Length CV to shorten or increase the length of the output pulse in real time.
  • Fast and slow ranges for both DELAY time and PULSE length - Fast range is 0.5mS to 2 Sec and Slow Range is 2 Sec to 30 Sec.
  • Green status LED shows when the output pulse is high.

Pricing and Availability:
See website.

More information:


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