Main, Reverb, Shape, Morph

Four panels sit below the waveform. They hold the dials that shape the grains. Every dial works the same way: drag up to raise the value, drag down to lower it, double-tap to reset to the default. Hold a dial for a moment and the next drag is in fine mode, for small precise changes. While you drag, a bubble shows the current value.

Main

The five grain dials you reach for most.

Dial	What it does	Range	Default
Size	Grain length. Longer grains are smoother; shorter grains are clicky and textural.	5 ms – 1500 ms (log)	~137 ms
Density	Grains spawned per second.	1 Hz – 512 Hz (log)	~42 Hz
Speed	Playback rate through the sample. Center is stopped; right is forward, left is reverse.	−200% – +200%	+100%
Jitter	Random timing offset added to each grain, for a looser cloud.	0 – 500 ms	50 ms
Spread	Random stereo placement per grain, from centered to a wide cloud.	0 – 100%	20%

Size and Density use a logarithmic taper, so the low end of each dial has fine resolution where small changes matter most.

Speed is a center-detent dial. The value arc grows outward from the middle, so you can feel your way back to 0% (stopped) or out to full forward or reverse. The taper is finest near the center, which makes slow speeds easy to set.

Reverb

Two dials feed a built-in reverb.

Dial	What it does	Range	Default
Reverb	How much reverb is mixed in.	0 – 100%	25%
Space	The size of the reverb space.	0 – 100%	50%

On iPhone these two dials live in the Advanced popup, reached from the compact knob page.

Grain Shape

Grain Shape sets the amplitude window each grain plays through, which changes how hard or soft the grain's edges are.

Setting	Sound
Soft	Grains fade in and out gently, for a smooth wash.
Round	A middle window. This is the default.
Sharp	Grains have hard edges, for a more percussive, grainy texture.

Tap a name to select it. On iPhone this control is in the Advanced popup.

Morph

Morph is the single gold knob. Turn it up and it pushes nine grain settings at once along a set path, so one gesture makes a large, coordinated move in the sound. The settings it drives include Density, Jitter, Spread, the pitch and reverse probabilities, grain dynamics, and Scan (a slow sweep of where in the sample grains are read from).

Morph is additive. It offsets from wherever your own dials sit, so moving a dial while Morph is up still works, and turning Morph back to zero returns every setting to your values. When a dial is being pushed by Morph, a faint gold ring on that dial shows how far.

Scan does not have its own dial. It moves only through Morph, at a fixed rate. Turn Morph up to bring it in.