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Sample Chop Suggester

You dropped a sample into your sampler and the chops are… wherever you put them. This tool gives you a defensible starting point: it slices your loop into the size that fits the chosen style (half-bar, quarter, off-beat or reverse-tail), draws a colour-coded chop grid you can read at a glance, and assigns each slice to an SP-404-style pad. It also labels each slice with a one-line "feel" note so you know which chop to reach for in a live set.

Sample settings

Total chops 8
Pad banks 1 (bank A)
Each slice 0.50 s

Chop grid

Each coloured block is one slice. Cyan = downbeat, fuchsia = off-beat, amber = ghost. Numbers above are beat counts inside the bar.

Pad bank assignment

Bank A — chops 1–16
Bank B — chops 17+
Copyable pattern

How to use

  1. Set the Sample BPM (or accept the auto-detect guess) and the sample Length in min:sec.
  2. Pick a Chop style. Quarter is the safe default for hip-hop; Half-bar works for house and breaks; Off-beat gives you that J Dilla shuffle.
  3. Drag the How many bars slider until the pad bank fits your loop (16 pads = 1 bank, 32 = 2 banks).
  4. Read the chop grid: the colour tells you what role the slice plays (downbeat, off-beat, ghost), the number is the beat position, the feel-note tells you when to reach for it.
  5. Hit Copy pattern and paste the result into your DAW / sampler session log. Use the pad-bank tiles as a visual cue card while you build the live performance.

How to read the result

The chop grid draws the sample left-to-right. Each coloured stripe is one slice; its width is the slice length. Above each stripe is the beat position (1.1 = bar 1, beat 1 in classic 4/4 timing), and below is a one-line feel note.

The colour code is borrowed straight from MPC/SP-404 practice:

  • Cyan — downbeat slice. Use as the "anchor" of a phrase.
  • Fuchsia — off-beat slice. Use as a syncopated hit or a transition.
  • Amber — ghost slice (very short, quiet). Use as a fill between hits.
  • Green — reverse slice. Use as a build or break.

The pad bank assignment follows SP-404 numbering: pad 1 is bottom-left, pad 4 bottom-right, pad 13 top-left, pad 16 top-right. Anything beyond 16 spills into Bank B.

Limitations

This tool assumes your sample is on a single steady tempo. If the loop has a tempo change (intentional rubato, half-time drop, build into double-time), the chop grid will misalign with the music. Manually nudge the first slice and shift the rest proportionally.

The off-beat style uses a 16th-note grid with a 12.5% swing. If your source is a swung live recording (e.g. a Dilla beat, a jazz break), the actual swing percentage may be 20–30% — listen, then move the off-beat slices earlier by hand.

Reverse-tail style is best-effort: it assumes the last beat has a tail long enough to reverse and still sound musical. If your loop ends abruptly (a gated reverb, a hard cut), reverse-tail will produce a click.

The pad-bank assignment is a starting grid. Real SP-404 / MPC workflows often group chops by similarity (all kicks on the bottom row, all vocal shots on the top), not by sequence. Re-arrange the pads to match your performance habits.

FAQ

How does the tool know the sample BPM?
It doesn't — BPM is an input. Type the tempo you intend to play it at. If the original sample is 85 BPM and you speed it up to 92, use 92. If you don't know the tempo, time-stretch a few cycles and tap along with a tap-tempo tool first.
Why does quarter mode give 4 chops per bar instead of 16?
A 1-bar sample at quarter slices = 4 slices (one per beat). That's the classic MPC workflow: 4 chops per bar × 4 bars = 16 pads, exactly one SP-404 bank. If you want 16th-note resolution, use the off-beat style (which slices every 16th) or set the bars slider to 1 bar with quarter mode and combine banks.
Can I use this for an MPC beats-from-scratch session?
Sort of — the pad bank is right, but the slice times assume a single audio loop, not a multi-sample kit. For a kit you'd need one slice per sample, not one slice per beat. Use the sample-chop output as a "where do I trigger each kick?" suggestion, then assign the kicks you already have to those positions.
What does "feel: ghost" mean?
A ghost note is a quieter, softer version of a main hit — used as a rhythmic texture between the louder hits. In a chopped-sample context it's the slice that's too short to be a full hit but too prominent to ignore. Reach for it as a fill, never as the anchor of a phrase.
Does the style "reverse" actually play the slice backwards?
This tool only suggests which slice to reverse; it doesn't render audio. To reverse a slice, render the slice in your DAW, bounce it, then reverse the bounce in your sampler. Most SP-404 / MPC models can also reverse in place.
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