How many samples and velocity layers does a multisample need?
You don't sample every key. A multisample usually has one sample every three or four notes, and the sampler pitch-shifts the nearest one to fill the gaps — small shifts are inaudible. Velocity layers are a separate axis: different samples for soft, medium and hard playing, so the instrument responds to how hard you press. Most realistic libraries use somewhere between two and eight velocity layers depending on the instrument. More samples means more realism and more recording work — the right number is the least that still sounds convincing. Xampler maps however many notes you give it across the keyboard.
- 1Pitch range: sample roughly every 3rd–4th note; let pitch-shifting cover the gaps.
- 2Simple/even sounds (pads, organs) need fewer; expressive ones (piano, brass) need more.
- 3Velocity layers: 2–8, depending on how much the timbre changes with playing force.
- 4Start small, add samples only where you can hear the stretch or the missing dynamic.
01How many notes do I actually need to sample?
How many notes do I actually need to sample?
For most instruments, one sample every third or fourth note is enough — the sampler pitch-shifts the nearest sample for the keys in between, and a shift of one or two semitones is inaudible. You only need more when the timbre changes a lot across the range. Recording every key is rarely worth the effort. Xampler maps whatever set you give it and stretches each sample to the next.
02What are velocity layers and do I need them?
What are velocity layers and do I need them?
Velocity layers are different samples triggered by how hard you play — a soft layer for light playing, a hard layer for forceful playing. They matter for instruments whose tone changes with force (piano, brass, drums). For sounds that don't change much with velocity (pads, organs) you may need only one layer. Two to eight is the usual range for realistic instruments.
03How many velocity layers is enough?
How many velocity layers is enough?
It depends on the instrument. Many good libraries use somewhere between two and eight: a piano benefits from several (soft to hard sound very different), while a sustained pad might need just one. More layers mean smoother dynamics but a lot more recording. Start with two or three and add more only if you can hear the jump between them.
04Is more samples always better?
Is more samples always better?
No — past a point you get diminishing returns for a lot more recording, editing and file size. The goal is the fewest samples that still sound convincing. Too few and you hear the pitch-shift stretch or the dynamic jumps; too many wastes effort. The right number depends on how much the sound varies across pitch and velocity.
05What's round-robin and is it the same as velocity layers?
What's round-robin and is it the same as velocity layers?
No — round-robin cycles through several samples of the same note and velocity so repeated hits don't sound identical (the 'machine gun' effect, common on drums). Velocity layers switch samples by how hard you play. They solve different problems and can be combined. Round-robin is most useful on percussive, repeated sounds.
06If I only have a few samples, will the instrument still sound good?
If I only have a few samples, will the instrument still sound good?
Yes, for many sounds — a clean instrument sampled every few notes with good loops can sound great with no velocity layers at all. Realism scales with samples, but a small, well-made multisample beats a large sloppy one. Get the mapping, tuning and loops right first; add samples later only where you hear the need. Xampler makes the small version fast to build.