Basimilus Iteritas Alter uses six tonal and one noise oscillator in three con gurations to generate sound.
e SKIN setting is a basic additive synthesizer meant to simulate instruments that have modes that do
not interact. LIQUID is the same as skin but with a pitch envelope for all oscillators. e rst oscillator
frequency is determined by the pitch input. e METAL setting modulates the oscillators by each other
to simulate instruments that have a lot of modal interaction. e SPREAD control adjust the pitch
(relative to the base pitch) of the other ve oscillators.
Each oscillator has an individual envelope that is controlled by the ATTACK, DECAY and HARM
controls. e noise envelope is also affected by the ATTACK knob.
e oscillators are summed and then the ATTACK envelope is applied to the sum. is then feeds into
a threshold-re ection folder with amplitude compensation and the ability to dynamically add more fold
stages. At very high settings the fold will add in an exponentially decaying pulse at the local minima
and maxima of the signal to add a gnarly buzz.
e nal step is another envelope. is envelope is derived from the overall shape of the six oscillator
envelopes. It adds back in the dynamics lost by folding so the output is remains punchy under the most
extreme folding.
Tone Generation
4
Simplified Synthesis Diagram
Noise Engineering
Basimilus Iteritas Alter
Analog-inspired parameterized drum synthesizer
Skin/Liquid
Metal
