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Message: [QUOTE="Bombastus, post: 91824, member: 2178"] GRN4 keeps every grain inside the waveform selection, even when the requested grain lasts longer than the selected audio. Once a grain reaches the boundary, the engine loops the available material with a crossfaded splice instead of reading beyond your marked region. Tiny selections can therefore become pitched micro-loops rather than merely short source windows. The distinction sounds small until you work with material containing several events. A snare hit followed by room decay, a vocal syllable beside a breath, or a noisy field recording can be narrowed to the exact fragment you want the grain engine to recycle. The selection is no longer just a rough neighborhood for grain starts. FRCTL also makes both selection edges modulation targets in [B][URL='https://goldmidi.com/community/threads/frctl-audio-debuted-grn-4-0-0-as-a-separate-plugin.77154/']GRN4’s selection-bound grain engine[/URL][/B]. Moving an edge can change which audio is available while also changing how much material sits inside the loop. At very short lengths, those two jobs start interacting in ways the release-note description barely hints at. [HEADING=2]Selection length and grain length now do different jobs[/HEADING] A long grain does not automatically need a long source selection in GRN4. If its playback duration exceeds the marked region, it wraps through that region and continues inside the same boundaries. You can therefore ask for a broad grain envelope while feeding it a much smaller piece of source audio. This separation matters because grain duration and source duration shape different parts of the result. Grain duration controls how long the individual event exists, while the selected region limits the audio available to fill it. A long grain over a tiny selection can repeat the same fragment several times before its envelope finishes. Shorten the selection around a stable vowel, and the repeated material can become noticeably tonal. Narrow it around noisy consonants, cymbal texture, or a rough transient, and the result can stay raspier because the tiny region itself contains less regular waveform movement. Same basic mechanism, very different raw material. Crossfading at the wrap point helps avoid a hard jump where the end reconnects to the beginning. The idea is established beyond this plug-in too, with [B][URL='https://patents.google.com/patent/WO2025149299A1/en']crossfaded grain switching[/URL][/B] used in granular systems to smooth transitions between pieces of audio. Crossfading does not guarantee a glassy tone, though, because the contents of the selected fragment still decide what repeats. [HEADING=2]Moving one boundary changes more than the source slice[/HEADING] Both edges can be moved independently, which makes one-edge modulation especially interesting. Shift only the left edge and the start of the available material changes while the selection also becomes shorter or longer. The modulation is therefore altering source position and loop duration at the same time. On a wider selection, this can move grains away from one event and toward another without letting them escape the marked area. On a very narrow selection, changing the width can also change the character of the pitched micro-loop because a different amount of audio is being recycled. Slow modulation can produce a controlled drift rather than the usual random spray across a large buffer. Moving both edges with related modulation offers another route. Similar movement on each side can slide a narrow window through the buffer while keeping its width closer to constant, depending on the modulation depths you assign. The useful part is practical rather than theoretical. You can separate scanning through source material from deliberately changing the micro-loop length. Freeze makes this easier to judge because the underlying captured audio stops changing. With a stable buffer, you can move the selection over a syllable, drum tail, texture, or held note and hear what the boundaries themselves are doing. Live input is less forgiving because the contents under the same region continue changing as new audio enters the buffer. [HEADING=2]Micro-loops reward careful source placement[/HEADING] Shrinking a selection to a sliver does not turn every recording into a clean oscillator. The chosen fragment still matters. A steady section with repeated waveform cycles is more likely to settle into a stable tone, while a slice containing a sharp transition can produce brighter or rougher repetition. Start with a frozen source and reduce the selection gradually instead of snapping immediately to the smallest possible width. Listen for the point where recognizable source detail gives way to a sustained pitch, then move either edge by a small amount. Nearby positions can sound markedly different because even a tiny shift changes the waveform being repeated. Grain size is worth adjusting separately once the micro-loop itself sounds useful. Longer grains can let the repeated fragment sustain under a broader envelope, while shorter grains make each event more exposed. Density then decides how many of those events overlap, so it changes the cloud without redefining the selection boundaries. The strongest use is often selective rather than constant. A phrase can remain recognizably granular with a wider region, then modulation can squeeze one edge inward until a narrow pitched fragment emerges for part of the motion. GRN4 can reach that behavior without letting the grain suddenly wander into neighboring audio, because the marked selection remains the hard source boundary. [/QUOTE]

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