My idea with this variation of this circuit bending
classic, is to make an instrument that is capable of making simple
repeating rhythms, coupled with expressive performance controls
to modulate the sound.
Each of the two independant LFOs is selectable as triggers for animal
or motor sounds. Either of the two phases of a LFO cycle can used
Pitch/speed modulation is implemented using LDRs, that are playable
in quite expressive ways using your hands to shade or using different
lightsources like LED bicycle lamps.
Pitch/speed potentiometers: controls pitch and speed
(cpu clock speed), one for bus sounds one for animal sounds.
LDR pitchbend: two LDRs, coupled in parrallel with the
pots, alter pitch/speed, of the sounds.
LFOs: Two independant squarewave oscillators (based
on one CD40106 hex Schmitt trigger). Each LFO can trigger the assigned
sound with either the positive or the inverted negative phase of
the squarewave. A red and a green led shows the current phase.
Sound select rotary switches: selects
which sound from either animal og motor sounds will be triggered.
The yellow switch selects motor sounds, the red animal sounds.
Trigger routing switches: The black
toggle switches selects which LFO will trigger the sound selected
by the sound selectors. The white toggle switches selects if the
sound is triggered when the red or the green LED of that LFO is
on. In the middle position multi-triggering is off.
Output select: three positions sliding switch with
positions: internal speaker, off and line out.