There’s no shortage of free samples online. Getting them into shape for your hardware is where the actual work starts.
A typical example: you grab a file from Freesound. It might arrive as 44.1 kHz stereo WAV, 48 kHz WAV, or OGG. To load it on the Squid Salmple, you need 16-bit, 44.1 kHz, mono WAV in a specific folder structure on a USB drive. To put it on a Morphagene reel, you need 32-bit float, 48 kHz, stereo WAV, named correctly, in the root of a FAT32 microSD card. The Octatrack wants 44.1 kHz stereo WAV and nothing else. Each device has its own rules, and free samples almost never arrive matching any of them.
The sources below are worth knowing about. Each entry covers what the site offers, how files are licensed, and which hardware it suits. The last section covers prep.
Freesound
URL: https://freesound.org
License: Creative Commons (CC0, CC BY, CC BY-NC, and others; varies by uploader). Check the individual file license before using anything commercially.
Freesound is the largest community-based audio library, with over six million clips uploaded by users. Quality ranges from unusable to excellent. Depth is what makes it valuable: field recordings, Foley, industrial noise, instrument recordings, crowd ambience, modular patches, and plenty of audio that doesn’t fit any obvious category.
For Eurorack use, Freesound’s main strength is long ambient source material. Environmental recordings, acoustic spaces, machinery, weather. The kind of audio that rewards granular processing. A 90-second recording of a tin-roof warehouse in rain is a Morphagene reel waiting to happen. A bowed metal object or a decaying gong works well as raw material for granular modules like the Multigrain or Nebulae v2.
Short percussion hits are harder to find at consistent quality, but they’re there. Filter by duration (under 2 seconds), by file type (WAV), and sort by downloads or ratings to surface the better material. For hits going to the Squid Salmple or Rample, also filter by sample rate (44.1 kHz) to reduce conversion work later.
Files arrive in the uploader’s original format. Most are WAV at 44.1 or 48 kHz, but not all. Download in original format, check what you have, and plan a conversion step before anything goes to hardware.
BBC Sound Effects
URL: https://sound-effects.bbcrewind.co.uk/
License: RemARC license. Free for personal, educational, and research use. Commercial projects need a separate license.
The BBC Sound Effects library is a professional archive built by BBC engineers over several decades. It covers transportation, architecture, nature, atmosphere, machinery, sports, and hundreds of other categories. Recording quality is consistent throughout: clean signal, minimal unwanted noise, professional mic placement.
For high-quality one-shot source material this is the most reliable free source going. The files are more immediately usable than most community-uploaded content, and the category structure makes browsing faster than Freesound’s search-first approach.
Files come as 48 kHz WAV. That works natively for hardware preferring 48 kHz (the Morphagene, Bitbox mk2, Erica Sample Drum) without conversion. Hardware expecting 44.1 kHz (the Squid Salmple, Rample, Octatrack) will need a resample step.
The main caveat is the commercial use restriction. For studio sound design and live performance not resulting in a commercial release, that’s not really a problem. For music you’re going to sell or license, check the current terms before you build a set around BBC files.
Internet Archive
URL: https://archive.org
License: Varies by collection and item. Many are public domain. Check individual item pages.
The Internet Archive holds more audio than most people realize. Two sections are particularly useful for hardware producers:
78 RPMs and Cylinder Recordings: thousands of pre-1950 commercial recordings, most in the US public domain. Old jazz, ethnic music, classical, novelty recordings. The surface noise and bandwidth limitations are part of the material. The Morphagene treats a grainy 78 RPM recording and a pristine field recording identically once it’s on a reel, and the harmonic saturation from old lacquer discs gives granular processing a character you won’t find in clean modern samples.
Old Time Radio and Spoken Word: broadcasts from the 1930s through 1960s, mostly public domain in the US. Less directly useful for music production, but field recording collectors and noise or drone producers find unusual source material here.
Formats are inconsistent across the archive. Expect MP3 alongside FLAC and WAV, sample rates from 22 kHz to 96 kHz. Budget more prep time per file than you would with Freesound or the BBC library. Download FLAC or WAV where available; MP3 artifacts become audible at the granular level inside modules like the Morphagene.
Free Music Archive
URL: https://freemusicarchive.org
License: Varies by artist. Creative Commons throughout, but not uniformly CC0. Many tracks are CC BY-NC.
The Free Music Archive holds complete tracks and albums from artists who’ve released under Creative Commons terms. It’s less useful as a traditional sample library, but it does have one specific use case worth knowing about: long granular source material.
A six-minute ambient or drone track released under CC0 is legitimate raw material for the Morphagene. The granular engine doesn’t care about melody or structure. Run a CC0 ambient release through the organize knob and you’ve turned someone else’s music into an instrument, which is musically and legally distinct from sampling a recognizable melody.
Check licenses before you commit. CC BY requires attribution. CC BY-NC means no commercial use. CC0 means no restrictions. The mix of licenses on FMA means you have to read each item page rather than assume blanket terms.
NASA audio archive
URL: https://www.nasa.gov/audio-and-ringtones/
License: US government works are generally public domain. Confirm with individual recordings.
NASA publishes mission audio, launch recordings, and sonifications: scientific data converted to audio by researchers at programs like Chandra and Hubble. Some of this sounds like nothing available in a commercial sample pack.
The sonifications from the Chandra X-Ray Observatory are particularly unusual. A neutron star or galactic center converted to audio gives you a slowly evolving texture with genuine scientific origin. As raw material for granular processing, it’s distinctive in a way that purpose-made ambient samples aren’t.
Some historical recordings are low-fidelity by necessity. The more recent sonification work is higher resolution. Files are available as WAV or MP3; download WAV where available, since MP3 compression introduces artifacts that become audible at fine timescales.
The use case here is narrow, but if you spend time on textural sound design, the archive is worth an hour of browsing.
Reverb
URL: https://reverb.com/shop/reverbsoftware
License: Varies by pack. Most are royalty-free for music production. Each download page lists its own terms.
Reverb’s software shop hosts a sizeable library of free sample packs alongside its paid catalog. The selection skews toward synth and drum-machine samples, vintage hardware multisamples, and producer-curated drum kits. Quality is generally high, since the packs come from name producers, plugin makers, and gear shops uploading promotional material.
The drum and percussion packs are the most immediately useful for hardware producers. Most files arrive as 44.1 kHz WAV, which slots cleanly onto the Squid Salmple and the Rample. Synth multisamples (sets of samples across pitches) are a good source for the Bitbox mk2 and other multi-sample-aware modules. Hardware that prefers 48 kHz (the Morphagene, Erica Sample Drum) will need a resample step.
You’ll need a free Reverb account to download. Pack contents and licensing terms vary, so read the description on each pack page before building anything around it.
Community sources
r/drumkits and r/WeAreTheMusicMakers on Reddit host threads with community-assembled kits and sample pack links. Quality and licensing require more scrutiny than organized archives, but community kits often cover genres and aesthetics that polished commercial free packs don’t, including genre-specific percussion and niche hardware-prepped collections.
squidbanks.com hosts pre-formatted Squid Salmple banks that go straight onto a USB drive without any prep work. If you own the Squid Salmple, check this before downloading raw samples. The Squid Salmple instrument page also lists SquidManager, a free bank editor for organizing content once you have it.
Hardware manufacturer Discord servers often have resource channels where users share samples. Look for your module’s manufacturer server or check ModularGrid community links for user groups. Files in these channels often come with format notes, or are already prepped for the hardware in question.
Picking samples for hardware
Not every free sample is worth the conversion time. A few things help narrow the field:
For granular modules (Morphagene, Multigrain, Nebulae v2, ER-301), long files with slow internal movement give the engine more interesting material than short loops or hit collections. Look for environmental recordings, instrument sustains, industrial ambience, anything with gradual timbral change. Duration of 30 seconds to a few minutes is ideal.
For sequencer-oriented hardware (Squid Salmple, Rample, Digitakt II, Octatrack), short, transient-heavy hits at consistent amplitude are more useful than long textures. Kick drums, snares, and one-shot percussion are directly slottable. Long loops need slicing before they work for pattern-based hardware.
For the Morphagene specifically, any stereo WAV under 174 seconds at reasonable quality is convertible to a reel. Finding interesting source material is rarely the bottleneck; the format conversion is.
Prepping downloaded samples for hardware
Every source above delivers files that work natively for some hardware and need conversion for others.
The Morphagene needs 32-bit float, 48 kHz, stereo WAV. A 44.1 kHz field recording from Freesound plays back about 8.8% fast and a half-step sharp without conversion, and the module doesn’t warn you. It just plays the file at whatever speed it expects.
The Squid Salmple needs 16-bit, 44.1 kHz, mono WAV, placed in the /alm022/Bank N/1..8/ folder structure on a USB drive. Stereo files need summing to mono. Files longer than 11 seconds get truncated. Drives formatted as exFAT won’t load at all.
The Octatrack wants 16 or 24-bit, 44.1 kHz stereo WAV. A 48 kHz file loads but plays at wrong pitch. A 32-bit float file isn’t supported.
The Morphagene prep guide covers the conversion process in detail, including the specific WAV chunk formats that matter for splice markers. The format comparison page has a compatibility table across hardware manufacturers.
All of this can be handled manually in a DAW or with tools like ffmpeg and sox. Or you can use SampleStack, which handles format conversion, folder layout, naming, and validation for everything above in one pass. Try it free for 7 days.