Chapter 4
Modulation
Making one control move another — where patches come alive.
After this chapter: “I can make a patch move on its own.”
4.1
Sources and destinations
Modulation means a source automatically moves a destination. An LFO (low-frequency oscillator) is the classic source: a wave too slow to hear, used to wiggle something you can hear. LFO → pitch gives vibrato. LFO → amp gives tremolo. LFO → cutoff gives a wah or a dubstep wobble.
Two knobs matter most: rate (how fast) and depth (how far). Sync the rate to tempo and the movement locks to the groove.
4.2
The mod matrix
Older synths hard-wired a few routings. Modern synths offer a mod matrix: a table of slots, each saying "this source moves that destination by this amount". Velocity, aftertouch, mod wheel, ribbons, envelopes and LFOs are all sources.
Good modulation is usually subtle. A slow LFO nudging cutoff by a few percent makes a static patch feel like it breathes.
On real gear · Hydrasynth Deluxe
Five LFOs, eight macros and a 32-slot mod matrix — plus polyphonic aftertouch and a ribbon controller as expressive sources you play with your hands.
Experiment #4-1
Patch an LFO
Let a slow wave turn a knob for you.
- 1.In the figure, raise DEPTH and watch the trace leave the dashed knob line.
- 2.In the Signal Path Explorer, set LFO DEST to CUTOFF, DEPTH 50%, RATE 4 Hz.
- 3.Switch DEST to PITCH and drop DEPTH to about 10%.
You should hear…
A rhythmic wah on cutoff, then a gentle vibrato on pitch.
Doesn’t sound right?
Nothing moving? DEPTH at zero leaves the LFO idle — the diagram shows LFO · 0.
- Hydrasynth Deluxe
- SH-01A
More recipes from this chapter
Full interactive panels with the same Manual & Panel layout — steps stay readable as text.
Check yourselfLFO routed to pitch at a small depth produces what effect?Reveal
Vibrato — a gentle, regular wobble in pitch.
Next on the path
Stamp the recipes above, then either keep reading or step onto the gear route when you want a specific instrument’s panel language.