Prepare Samples for the SP-404, Digitakt & MPC
Hardware samplers are less forgiving than a DAW. A DAW quietly resamples whatever you drag in; a sampler either converts on import — slowly, and sometimes badly — or plays the file at the wrong speed. Every box also has one native format it actually stores, and feeding it exactly that format makes imports instant and removes a whole category of “why does this sound different on the hardware” problems. This guide covers the SP-404MKII, the Digitakt, standalone MPCs and the Octatrack, plus the file-naming habits that keep a 500-sample SD card usable on a small screen.
The short answer
- SP-404MKII: 48 kHz, 16-bit WAV.
- Digitakt: 48 kHz, 16-bit, mono WAV — sum stereo files yourself first.
- Digitakt II: 48 kHz WAV, stereo is fine.
- MPC One / Live / X / Key: 44.1 kHz, 16- or 24-bit WAV.
- Octatrack: 44.1 kHz, 16- or 24-bit WAV, stereo supported.
- Name files with tempo and key up front:
140_Fm_bass-stab.wavbeatsfinal_bass_v3 (1).wavon every device screen ever made.
Device specifics
| Device | Native format | Imports | Notes |
|---|---|---|---|
| Roland SP-404MKII | 48 kHz, 16-bit | WAV, AIFF, MP3 (app adds FLAC, M4A) | Everything is converted to 48 kHz 16-bit on import. Delivering that exact format makes SD-card imports near-instant. |
| Elektron Digitakt | 48 kHz, 16-bit, mono | WAV via Elektron Transfer | Transfer converts anything — but takes only the left channel of stereo files. Sum to mono before sending. |
| Elektron Digitakt II | 48 kHz, stereo or mono | WAV via Transfer | Stereo playback is native. Mono still halves memory use, so keep drums and bass mono anyway. |
| Akai MPC One / Live / X / Key | 44.1 kHz | WAV, AIFF, MP3, FLAC | Standalone mode runs at 44.1 kHz regardless of what you import. 44.1 kHz WAV loads without resampling. |
| Elektron Octatrack | 44.1 kHz, 16/24-bit | WAV, AIFF (44.1 kHz only) | No import conversion at all — a 48 kHz file simply plays back slow and flat. Convert before it touches the CF card. |
| Anything older or unlisted | Usually 44.1 kHz, 16-bit, mono | Check the manual | 44.1/16 mono WAV is the safest default for legacy hardware — small, universal, and pre-2010 boxes rarely accept anything else. |
The left-channel trap
The single most common “my sample sounds wrong on the Digitakt” report isn't a rate problem — it's the stereo conversion. When Transfer meets a stereo file it doesn't sum the channels; it keeps the left one and discards the right. A wide pad, a ping-pong delay tail, a hi-hat panned right: gone or lopsided, and it's easy to blame the hardware. Converting to mono yourself with a proper L+R sum — the Mono/Stereo Converter does this — means you decide what the mono version sounds like, not the transfer tool.
Why matching the native rate matters
Two different failure modes, depending on the box. Samplers that convert on import (SP-404MKII, MPC, Digitakt via Transfer) will accept a mismatched file, but you're trusting a converter written for a device CPU, and on big batches the import time adds up. Samplers that don't convert (Octatrack) just play the file at their own rate: a 48 kHz sample on a 44.1 kHz machine comes out roughly a semitone flat and 9% slow. Doing the conversion once, on a computer, with a good resampler, sidesteps both. The Sample Rate Converter handles 44.1 and 48 kHz WAV output with selectable bit depth.
File naming that survives a 2-inch screen
Sampler browsers show one short line per file, sort alphabetically, and have no search. Naming is your only database, so make the first characters do the work:
- Tempo and key first:
140_Fm_bass-stab.wav,174_Am_break-tight.wav. Files sort by BPM automatically and you can see at a glance what fits the project. - One-shots vs loops: suffix loops with the bar count (
_4bar) so you know what needs tempo-sync before you audition it. - Keep it short: device screens truncate long names, and two files that differ only past the cutoff become indistinguishable. Aim for under 24 characters.
- ASCII only, no spaces: letters, numbers, hyphen, underscore. Accented characters and emoji render as garbage or refuse to load on FAT32-formatted cards.
- Folders by kit, not by type: a folder per kit or project (
drums-dusty/,trip-hop-01/) loads as a unit; a globalkicks/folder with 300 files means 300 button presses.
Batch-prepping a folder for the hardware
- Trim each sample tight with the Audio Trimmer — memory is measured in minutes on these boxes, and silence is the first thing worth cutting.
- Sum to mono where the target is mono (Digitakt, or by choice for drums) with the Mono/Stereo Converter, so the L+R sum happens on your terms.
- Convert the rate last with the Sample Rate Converter: 48 kHz 16-bit for the SP-404MKII and Digitakt, 44.1 kHz for MPC and Octatrack.
- Level-match one-shots with the Loudness Normalizer so pad volume differences reflect your mixing, not the source files.
- Rename before copying to the card — renaming on the device is the worst text-entry experience in music hardware.
Common problems and the format fix
- Sample plays slow and flat — rate mismatch on a non-converting device. Resample to the machine's native rate.
- Stereo image collapsed or elements missing on Digitakt — Transfer kept the left channel only. Sum to mono first.
- Import takes forever — the device is converting every file. Deliver the native format.
- File refuses to load — wrong container or exotic characters in the name. Export plain WAV, rename to ASCII.
- Ran out of sample memory — stereo files where mono would do, or untrimmed tails. Mono halves the footprint; trimming does the rest.
- Two files look identical in the browser — names differ only after the screen truncates. Put the distinguishing part first.