Sample Editor

Overview

This is where multisamples come together. The EP-40 supports 5 different playback modes and up to 8 zones per multisample. The official tool doesn’t let you create these at all.

Drag in your samples, map them across the keyboard, tweak the envelope and other parameters, then send it to your device. That’s it.

The Drum Kit layout gives you a hardware-style pad grid with drag-to-assign and LED indicators. Auto zone mapping and scale-aware distribute are free.

Which devices?

The editor works with every EP device, but not every mode does. Multisample mode (Melodic or Drum Kit) builds multisamples for the EP-40, in Teenage Engineering’s TNGE multisample format, and Loop mode is EP-40 only. The EP-133 doesn’t play multisamples. On any EP device, the editor trims, processes and tunes single samples before you send them across. The zones, envelope and 8-sample limit covered below are details of the EP-40 format.

Editor modes

Choose from four modes depending on your needs. Multisample has two layouts, Melodic and Drum Kit:

One Shot

One-shot playback of a single sample. Perfect for drum hits, sound effects and samples that play once without looping.

Use for: Kicks, snares, percussion, FX

Loop

Continuous looping playback of a single sample. Ideal for sustained sounds and textures.

Use for: Pads, drones, atmospheric textures

EP-40 only: loops use the EP-40 format and won’t carry over to the EP-133 or EP-1320.

Key

Single sample mapped across the keyboard with pitch shifting. Create melodic instruments from a single recording.

Use for: Bass lines, lead melodies, simple instruments

Multisample (Melodic)

Multiple samples (2-8) mapped to keyboard zones for melodic instruments. Each zone can have its own root note and key range.

Use for: Realistic instruments, chromatic synths, complex melodic patches

For the EP-40: multisamples use the EP-40 format.

Multisample (Drum Kit)

Multiple samples (2-8) mapped to individual keys for drum kits. Each pad triggers a different sample. The Drum Kit layout includes a hardware-style pad grid with orange LED indicators for loaded pads and drag-to-assign functionality.

Use for: Drum kits, percussion sets, sound collections

For the EP-40: the Drum Kit layout builds a multisample in the EP-40 format.

Tip: Use Z/X keyboard shortcuts to navigate octaves in the Drum Kit layout

Loading samples

Adding audio files to your multisample:

Pick Multisample mode first (Melodic or Drum Kit). It’s the only mode that takes several files at once. One Shot, Key and Loop take one sample.
Click “Add Samples” and select one or more audio files from your computer (WAV, AIFF or MP3), or drag them in
You can also import OP-1 drum kit files (.aif/.aiff), which load all 24 samples at once, and existing TNGE multisample files
Samples will appear in the drop zone area
Drag and drop samples to reorder them if needed

Sample Limits

Maximum 8 samples per multisample, with a total duration limit of 20 seconds across all samples. The app will warn you if you exceed these limits.

Keyboard & zone mapping

The virtual keyboard shows how your samples are mapped across the EP-40’s pads:

C3=60 / C4=60 toggle: Switch between octave numbering conventions
Zone indicators: Visual markers show the range of each sample zone
Root note: Indicates the original pitch of each sample
Click to play: Click any key to preview the sound

Zone mapping tools

Tools for quickly mapping samples across the keyboard in Multisample mode (Melodic and Drum Kit):

Auto zone mapping

Automatically assigns root notes and zone boundaries for your samples. It’s free.

Scale-Aware distribute

Evenly distributes zone boundaries across the keyboard, respecting the selected musical scale. Supports all 10 EP device scales including Major, Minor, Dorian, Phrygian, Lydian, Mixolydian, Aeolian, Locrian, Pentatonic and 12-tone Chromatic.

Searchable note selector

Type-ahead filtering in the note dropdown lets you quickly find and assign root notes. Press Enter to select the first matching result.

Play mode selector

Set the play mode for each sample to control how it behaves on the device:

Oneshot: Sample plays once from start to end when triggered
Key: Sample plays while the pad is held, stops on release
Legato: Like Key mode, but overlapping notes share the same voice

The play mode is saved with your sample and transferred to the device.

Sound parameters

Control sound shaping for your entire multisample or individual zones:

Amplitude controls

Volume: Overall loudness
Pan: Stereo positioning (left/center/right)
Velocity: Response to pad hit intensity

Envelope

The EP-40’s envelope is attack and release only (there’s no decay or sustain), and it’s global to the whole multisample rather than per zone.

Attack: Fade-in time
Release: Fade-out time when released

Pitch & tuning

Pitch: Coarse tuning in semitones
Fine tune: Precise tuning in cents
Root note: Base pitch for each zone

Advanced audio editing

Click on any loaded sample to access advanced editing tools:

Waveform Editor

Visual waveform display
Trim sample start and end points
Set loop points by hand, and use Snap to Zero to move a marker you’ve placed to the nearest zero crossing
Zoom and navigate the waveform

Processing tools

Normalise: Maximise volume without clipping
Fade in/out: Smooth transitions
Reverse: Play sample backwards
Time stretch: Change duration without affecting pitch
Pitch shift: Change pitch without affecting tempo

Dynamics & EQ

Compressor: Control dynamic range
Gate: Remove low-level noise
Limiter: Prevent clipping
EQ: Shape frequency content

Fit More

In One Shot or Key mode, with a sample loaded, Fit More makes it smaller on a K.O. II. One tap switches on mono, a lower sample rate and, if the pitch allows it, Double Speed, then shows how much space you save. Undo puts it all back, and Change lets you pick each setting yourself. It’s free. The Fit More guide has the detail.

Fade Out All

In Multisample mode, Fade Out All fades the end of every loaded sample to silence in one step, so a sample you trimmed mid-note stops without a click. Set the length in milliseconds (10 ms is usually enough). The fade ends at each sample’s Out point, and a loop is left as it is. It’s one undo step.

Chop Sample

Chop Sample slices a sample by its hits, into equal parts or to a tempo grid, then puts the slices on a Drum Kit, makes a multisample, exports WAVs or sends them to your EP.

Importing OP-1 drum kits

EP-PatchStudio can import drum kits from the Teenage Engineering OP-1:

Select Multisample mode and switch the layout to Drum Kit
Click “Add Samples”
Select an OP-1 .aif drum kit file
The kit will be automatically split into individual samples
Adjust parameters and save to your EP-40

Saving & exporting

Saving your multisample:

Click the “Save to Device” button (requires connected EP-40)
Choose a project slot (1-8) on your device
The multisample will be transferred to your EP-40 Riddim
You can now access it from the device

Upload to slot

If you loaded a sample from your device, the “Upload to Slot” button lets you send it back to the original slot after editing, no need to browse for the right location.

Exporting for backup

You can also save a multisample as a WAV file to back up or share your work. The EP-40 uses the TNGE format, which is a WAV with the keyboard mapping baked in, so you can load it straight back into EP-PatchStudio later.

Your edits are saved as you go in every mode, so you can get them back after a crash. The editor asks before an import, a chop or the File Manager’s Edit replaces the samples you’re working on.

Tips & best practices

Normalise samples first: Ensures consistent volume across zones
Use loop mode for pads: Creates sustained sounds from short samples
Set appropriate root notes: Ensures accurate pitch tracking in Multisample mode
Watch the total duration: Stay under 20 seconds to fit all samples
Use envelope for shaping: Attack and release can dramatically change the character