User Manual

MODULATION

Iris 2 | ENVELOPES Page 55

Digital

If you’re looking for a modern hard-edged modulation sound, the Digital category has

a range of stairs, pyramids, ramps and pulses to add an angular grid-like sound to any

parameter. Turn on LFO Sync to further lock these shapes to your DAW’s grid and tempo.

Multiply

To move beyond standard modulation and into the realm of Frequency Modulation (FM)

and Amplitude Modulation (AM) synthesis, the Multiply shapes provide sped-up versions

of the Analog Sine, Saw, Square, and Triangle shapes. This allows you to modulate up

to 50 times faster than a standard LFO in order to generate audio sideband frequencies

providing extra tone shaping and synthesis options.

ENVELOPES

An envelope is triggered by a MIDI note. Envelopes are used to shape the contour of

a sound. This shape is broken into a number of parameters that describe how a sound

changes over time. Iris 2’s envelopes have four parameters: Attack, Decay, Sustain, and

Release. The most common thing to apply an envelope to is the gain or ﬁlter cuto. By

default Envelope 5 is applied to the Master Gain knob to ensure that the default sound of

Iris does not make undesired clicking sounds. If there is no envelope applied to gain then

a sample can make instantaneous full-scale sound when a note is played which can cause

clicking. The Envelope makes a very quick ramp up of the volume to smooth out those

undesired clicks.

With Envelope 5 applied to the Master Gain of Iris 2 the ADSR parameters do the following

with each note that is played: