Source Audio C4 Synth - LFO 1 & 2 Modulation; LFO Wave Shape and Speed Controls

SA249 C4 Synth User Guide 30
LFO 1 & 2
The LFOs (Low Frequency Oscillators) can be set to control the Filter modulation, Sequencer rates, or
Tremolo rates (amplitude modulation).
• LFO Wave Shape Selector Dropdown Menu: Choose from 14 different LFO wave shapes.
Each wave shape evokes a different character from the Filter and Tremolo modulation.
Choose from a range of sounds from a smooth Sine wave modulation to a choppier Square
wave modulation.
• Restart on Env 1 Trigger Button: Selecting this button allows you restart an LFO pattern
every time a new note is struck. This can be especially noticeable with slow moving LFO rates
or oddly shaped LFOs like the 4 Step or Rising Saw. It is also useful when using an LFO to
control a Sequencer pattern by allowing you to restart the Sequencer pattern with each
strike of a note.
• LFO Time Ratio Dropdown Menu: The C4 limits the user to one LFO wave shape at a time,
but it is possible to run two LFOs at different Beat Divisions. For example, by selecting “LFO 2
= 2x LFO 1,” LFO 1 would run at a quarter note beat division while LFO 2 runs a 16
th
note beat
division.
• Speed Knob: Adjusts the rate of the LFO. Please note that if LFO 1 and LFO 2 are set to
different beat divisions, both rates will increase or decrease to scale during Speed knob
adjustments.
• Envelope To Speed: Relies on the envelope filter to increase or decrease the speed of the
LFO. Increasing this knob past 12 o’clock causes the LFO to modulate faster upon the initial
strike of a note then slow as the note fades. Turning the knob to the left of 12 o’clock creates
the opposite effect where the LFO modulation slows on the initial strike then speeds up as
the note fades.
• Envelope to Depth Knob: Relies on the envelope filter to increase or decrease the depth of
the LFO. Increasing this knob past 12 o’clock produces a deeper LFO modulation upon the
initial strike, which then smooths as the note fades. Turning the knob to the left of 12 o’clock
creates the opposite effect where the LFO modulation is smooth upon the initial strike and
deepens up as the note fades.