Sample Editor

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 ADSR and other parameters, then send it to your device. That's it.

Since v0.31, Kit mode is available in the editor with full feature parity — a hardware-style pad grid with drag-to-assign and LED indicators. Auto zone mapping and scale-aware distribute are included in the free tier.

Adding audio files to your multisample:

1. Click the "Add Samples" button in the top right
2. Select one or more audio files from your computer (WAV, MP3, FLAC, AIFF, OGG and more)
3. Samples will appear in the drop zone area
4. Drag and drop samples to reorder them if needed

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

Tools for quickly mapping samples across the keyboard in Multi and Kit modes:

Auto Zone Mapping

Automatically assigns root notes and zone boundaries for your samples. Available to all users (previously Pro-only).

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.

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.

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 (ADSR)

• Attack: Fade-in time
• Decay: Time to reach sustain level
• Sustain: Held volume level
• 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

Click on any loaded sample to access advanced editing tools:

Waveform Editor

• Visual waveform display
• Trim sample start and end points
• Set loop points with automatic detection
• 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

Auto Tools

• Transient detection: Automatically detect note starts
• Auto-chop: Slice samples at transients

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

1. Select "Kit" mode in the Editor Mode selector
2. Click "Add Samples"
3. Select an OP-1 .aif drum kit file
4. The kit will be automatically split into individual samples
5. Adjust parameters and save to your EP-40

Saving your multisample:

1. Click the "Save to Device" button (requires connected EP-40)
2. Choose a project slot (1-8) on your device
3. The multisample will be transferred to your EP-40 Riddim
4. 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 export multisamples as project files to save and share your work. Use the File menu to save or load .epps project files.