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UPDATE
- Fixed a bug where the restarting and playing a sequence would miss the first note from the original, first play through.
- Fixed a bug where the values of Max Note and Start Note were not correctly restored when a preset was loaded.
- Added a Run/Stop button which allows running and stopping of the AIS to be controlled even when a constant clock or MIDI gate signals is available on the relevant input.
- Run button has a switch to determine whether pressing run will restart the sequence from where it stopped or restart it from the beginning.
- Running the sequence can be started from a trigger signal applied to the "Trig. In" jack.
- Starting and stopping the sequence, either externally or by clicking the Run button, will send a positive trigger from the Trig. Out jack.
The Aleatoric Inteval Sequencer (AIS) is, ultimately, a random note generator but less much simplistic.
In the early years of analogue synthesis the most obvious example of random note generation was the connection of a white noise generator into a clocked Sample and Hold circuit with the output being used as the pitch cv for an oscillator. Rather than being purely random the AIS adheres to the mid-twentieth century idea of aleatoric when Werner Meyer-Eppler defined it thus, "a process is said to be aleatoric if its course is determined in general but depends on chance in detail”
The AIS uses random numbers, not to directly select the next note, but to select the interval between the current and next notes. In the case of purely random note generation the next note could occur anywhere within the allowed range of notes but random interval generation lets the user specify the probability that the jump to the next note will be large or small, up or down.
The AIS also limits generated notes to fall within a user-nominated key and heptatonic scale. So, the next note to be played is determined by:
- The last note played, as the next note will be a random interval above or below it.
- The upper and lower note boundaries set for the sequencer’s output.
- The user-chosen key and scale.
- The likelihood of each interval, as set by the user on the various Interval Likelihood knobs.
- The degree of centrality, set by the user, which reduces the probability of selecting an interval that would bring the next note close to the upper or lower note boundary.
- The High/Low bias control which determine whether to favour the interval moving up or down.
- The Tonic bias which increases the probability of selecting an interval that would make the new note return to the tonic of the chosen scale.
The AIS is also Phone Bank compatible for storing and retrieving initial states. More details are available in the user manual and some demonstrations are available on YouTube.