ERX10 SLC

The five pages

Getting started

The first time you open the app, click SOURCES in the top right to add one or more library folders. You can add as many sources as you need — for example, your personal instruments folder and a CDR collection on an external drive. The app remembers these between sessions, and they're shared with the Edulator via ~/.erx10/library-config.json.

When you have multiple sources, tab buttons appear below the header — click to jump between libraries. Each source has an editable label.

Navigating

• 1Click any folder to open it. The breadcrumb trail at the top updates as you go deeper.
• 2Click any part of the breadcrumb to jump back to that level instantly.
• 3Click ROOT to go all the way back to the top.
• 4Click REFRESH if you've added files from Finder and want the view to update.

Selecting a file

Click any instrument or image file to select it. The Actions panel on the right side of the screen shows what you can do with that file.

A selected EFE file with the Actions panel open on the right

Search & tag filtering

The search bar and tag chips at the top of the Library page let you find instruments instantly across your entire collection.

• 1Type in the search box and press Enter or click SEARCH. Matches instrument names, file paths, and tags.
• 2Click a tag chip (KEYS, LEAD, BASS, PAD, DRUMS, etc.) to filter. Multiple tags AND together.
• 3Click a search result to navigate to that folder.
• 4Click CLEAR to exit search mode and return to normal browsing.

Searches work across all your library sources at once. Tag colours match the byME Ensoniq marketplace.

Filtering by BASS tag — 12 results found instantly

Tagging instruments

Select any EFE, EFA, or ERX10 file. The TAGS section appears in the Actions panel. Click any tag chip to toggle it on/off for that instrument.

Click + custom to create your own tags. Tags are stored in catalog.json in each library source folder.

Auto-tagging from byME downloads

When you download instruments from the byME Ensoniq Sound Library, the category tag is embedded in the filename — for example [bass] SYNBASS.EFE.

When you drag these files into Library Control, the [tag] prefix is automatically detected and the instrument is tagged in your catalog. No manual tagging needed.

Drag and drop from Finder

Drag EFE, EFA, INS, ERX10, IMG, ISO, or WAV files from Finder directly onto the Library page. Files are copied into the folder you're currently browsing. A green overlay confirms the drop, and the view refreshes automatically.

What you can do with each file type

Two panels

Left — Library Images: Disk images already in your library folder are listed here automatically. Each has a BROWSE button to open it.

Right — SD Card / ZuluSCSI: The app scans your mounted volumes for Ensoniq disk images. If your SD card is plugged in and mounted, it will appear here. If it shows "No SD cards detected," check that the card is mounted in Finder.

Importing an instrument

• 1Click BROWSE next to any image, or click OPEN DISK IMAGE FILE... to pick any image manually.
• 2The image's directory structure appears. Navigate into folders by clicking them.
• 3Click IMPORT next to the instrument you want.
• 4A destination picker opens. Browse your library folders to find where you want it saved. Use the text field and CREATE button to make a new folder if needed.
• 5Click IMPORT HERE. The instrument is extracted and saved. It shows an "IMPORTED" badge so you know it's done.

You can import multiple instruments in a row — each gets its own destination picker. The "IMPORTED" badges stay visible so you don't lose track of what you've already grabbed.

BUILD tab — creating a new disk image

Image Builder BUILD tab — drop zone for EFE/EFA files, Image Mode selector on the right

• 1Make sure CREATE NEW IMAGE is selected in the Image Mode panel on the right.
• 2Add your EFE/EFA files — click + ADD EFE/EFA FILES or drag and drop them onto the dotted drop zone.
• 3Use the ↑ arrows to reorder, or ✕ to remove any file you don't want.
• 4Click BUILD IMAGE. A save dialog opens — name your image and choose where to save it.
• 5Done. The image is created with all your instruments inside, in the order you specified.

BUILD tab — adding to an existing image

ADD TO EXISTING — EFE/EFA file picker for selecting instruments to add

• 1Select ADD TO EXISTING in the Image Mode panel. An image picker opens — select your disk image.
• 2The image's directory structure appears. Navigate to the folder where you want the new instruments to go.
• 3Click ADD EFE/EFA HERE. A file picker opens — select the EFE/EFA files to add.
• 4They are written immediately. A success panel appears with two options: MANAGE IMAGE to inspect the result, or DONE to go again.

Navigate to the target directory inside the image, then click ADD EFE/EFA HERE

MANAGE IMAGE tab

Full file management inside a disk image. Open any image and you get a live directory listing you can sort, reorganise, and edit.

Manage Image tab — OPEN IMAGE button, toolbar with ALL / + DIR / DELETE / COPY TO / MOVE TO

Inside a directory — 38 instruments listed with slot numbers and block counts

Toolbar buttons

Selecting items

Selected items show a green ✕ in their checkbox. The toolbar shows the count of selected items at all times.

What the columns mean

FORMAT NEW tab — blank disk images

Creates a properly formatted Ensoniq disk image from scratch — no external tools needed. The image is written natively with the correct block structure (ID block, OS block, FAT, root directory).

• 1Enter a disk label (up to 7 characters). This is shown on the ASR-10 when loading.
• 2Pick a size preset: EPS DD Floppy (800 KB), ASR HD Floppy (1.6 MB), 64 MB, 128 MB, 256 MB, 512 MB, 1 GB, or 2 GB.
• 3Click CREATE IMAGE. Choose where to save it.

The resulting .img file is ready to use — copy it to your ZuluSCSI SD card as HD0.img, or use the BUILD tab to add instruments to it.

The seven conversions

What the dialogs look like

Each RUN button triggers the macOS file picker. Here are the three you'll see most often:

EFE/EFA file picker — your imported instruments ready to select

Disk image picker — select the .img file to convert or write to

Save dialog — name your output file and choose where to save it

Bundled tools

The app bundles three command-line tools that do the heavy lifting behind the scenes. The Info page shows whether each is present and working. You never need to interact with them directly.

Ensoniq instrument files

Note: EFE and EFA are identical internally. The different extension is just a naming convention from the hardware era.

Plugin presets

Disk images

What macOS writes behind your back

Every time you open an SD card in Finder, macOS silently creates:

The ._ resource fork files are the most dangerous. If your image is called HD40_512 Ensoniq ASR-10 OS.img, macOS creates a ghost file called ._HD40_512 Ensoniq ASR-10 OS.img. ZuluSCSI scans for files matching HD*_*.img — and the ghost file matches that pattern. This can prevent your sampler from booting.

What Library Control does about it

The app automatically cleans your SD card after every write operation. Whenever you copy an image or EFE file to a removable drive, the app:

• Deletes all ._* resource fork files
• Deletes all .DS_Store files
• Removes .Spotlight-V100, .fseventsd, and .Trashes folders
• Creates a .metadata_never_index file to stop Spotlight from indexing the card in future

This happens automatically — you don't need to do anything when using the app.

If you copy files manually (outside the app)

If you ever drag files to your SD card using Finder directly (not through Library Control), you must clean it before ejecting. Open Terminal and run:

Replace YOUR_SD_CARD_NAME with your SD card's actual volume name.

Or download the auto-cleaner script — just double-click it:

Unzip, then double-click Clean-SD-Card.command. It opens Terminal, finds your SD card, and cleans it automatically.

Golden rules for SD cards

• Always eject properly — right-click the SD card in Finder and click Eject, or use the eject icon. Never just pull the card out.
• Use the app for all SD writes — Library Control cleans up automatically after every operation.
• If your sampler suddenly can't boot — put the card back in the Mac, run the Terminal cleanup above, eject properly, try again.
• Format fresh if in doubt — use Disk Utility to format as MS-DOS (FAT32), then copy your images back.

Everywhere

Image Builder — Manage Image tab

Image Builder — Build tab