Supported Features
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VoiceOver
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Voice Control
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Dark Interface
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Differentiate Without Color Alone
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Reduced Motion
It's 404, Yo!
SP-404 sample pack converter
Only for Mac
$0.99
Mac
"Unsupported File" on your SP-404 MkII? Drop a sample pack in, get clean 16-bit WAVs out. Batch, offline, folders kept.
Drop a sample pack. Get it back ready for your SP-404 MkII. No DAW, no Terminal, no cryptic "Unsupported File."
It's 404, yo! is a tiny, native macOS utility that batch-converts an entire sample pack into exactly the format the Roland SP-404 MkII accepts on SD-card import, and tells you in plain language what it changed.
WHY YOU NEED IT
Pro and Splice sample packs are usually 32-bit float WAVs (often 96 kHz, sometimes FLAC). The SP-404 MkII rejects them with "Unsupported File" and no explanation. Fixing them by hand in a DAW, one file at a time, is miserable across hundreds of samples.
WHAT IT DOES
• Drag in a folder (or files): your whole pack at once
• See every file analyzed, with a clear reason for each change ("32-bit float → 16-bit", "96 kHz resampled", "FLAC → WAV")
• Convert to the SP-404-safe target: 16-bit linear PCM WAV at 48 kHz (or 44.1 kHz)
• Already-compatible files are copied untouched: no needless re-encoding
• Your folder structure is preserved in the output
• Optional file-name cleanup for names the SP-404 struggles with (accents, odd characters)
• Warns about edge cases (over 16 min / ~185 MB, or under 100 ms)
SIMPLE BY DESIGN
One job, done well. No accounts, no subscriptions, no cloud. Everything runs offline on your Mac. Your samples never leave your computer.
FROM THE MAKER OF "It's mono, yo!"
Built for the same hardware-sampler workflow by an indie developer who uses this gear.
Roland and SP-404 are trademarks of their respective owners. This app is independent and not affiliated with or endorsed by Roland.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Two small changes.
Send Feedback. Help › Send Feedback… opens an email to support with your app and macOS version already filled in. Nothing is sent until you send it, so if a pack won't convert or something looks off, that's the quickest way to tell me.
Clearer drop zone. The outline around the drop area is easier to see in light and dark mode.
The developer, IAMJARL, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
The developer indicated that this app supports the following accessibility features. Learn More
Information
- Seller
- Iamjarl
- Size
- 226.7 KB
- Category
- Music
- Compatibility
Requires macOS 13.0 or later.
- Mac
Requires macOS 13.0 or later.
- Mac
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 IAMJARL
