Is this circuit we interrupt the random sequence after 2 or 3 tones.
Use the '2 or 3 tones' pushbutton to choose one or the other.
The 'interrupted or continuous' button switches between interrupted or continuous sequences.
Start with a 2 tone interrupted sequence.
With small step sizes you will be able to hear
whether the second tone is lower of higher than the first tone,
even at very fast rates.
You will also be able to hear fusion in the fastest sequences.
In a two-tone sequence with a step size of about 20 semitones,
and a tempo of 20 tones per second,
it is much more difficult to hear in which direction the pitch moves:
the two tones seem to be more or less simultaneous.
At lower tempos, however, the direction in which the pitch moves can be heard clearly.
Now switch to the 3 tone sequence.
There will be two kinds of sequences produced by the random process:
straight ones with two steps in the same direction
and folded ones with one up and one down step.
It is clear that in the folded ones
the grouping of the first and the third tone in the groups, which have the same pitch,
make it much more difficult to hear the sequence as a coherent whole.
In the straight sequences this fission does not happen.
The switch between continuous and interrupted sequences is provided
to compare the sequences at the same tempo.
It can be observed that in the continuous sequences the
coherence is lost at lower speeds than in the interrupted ones.