USB stick problems

Jakob posted May 13, 13:26:

This is a noob question, but what do I need to do with a USB-stick with samples in terms of formatting etc to get it to work? I got the samperboxworking fine, I can play the default sound with a usb-midi keyboard, no problem. I've tried just taking a thumb drive and adding directories with samples named /0 Somethingorother/, /1 Somethingelse/, etc, but to no avail. I'm really shit at this, so please use small words. I'm on a Raspberry Pi B original.

Thanks in advance for any insights.


Jakob posted May 13, 13:28:

Oh, and by the way, I'm a mac user (through no fault of my own, mind you).

AlexM posted May 13, 15:08:

How are your samples filenames named? And are you using an (optional) definition.txt file?

Jakob posted May 13, 16:05:

I've been using the sample folders downloadable from, just to try to make it work first. The Mellotron sample is named 343_G2, 3444_G#2, etc. One of the Poly 61 sample directories contains files named just c1, c2, etc. In that folder there's a definition.txt (what is that, anyway?). I also found this bit of info: "the samplerbox build doesn't like GUID Partitioning Scheme. It detects a disk, and tries to mount it, but the mount point is empty. This means, on a Mac you can't use the GUI application "Disk Utility" to make your FAT32 disk, you need to do it via the command line." Might that be the problem?

Thanks a bunch for answering.

Jakob posted May 13, 19:12:

Update: I've formatted the thumb drive from the terminal. Still nothing.

AlexM posted May 14, 10:59:

The definition.txt file is described at point 6) in the FAQ:

What kind of MIDI keyboard are you using? The Mellotron samples start from G2, so if it's a small keyboard maybe you have to set the octave higher on your keyboard to reach the samples.

I wouldn't have thought your USB disk format would be an issue - but I can't test it myself (Windows)

Jakob posted May 14, 11:33:

Thanks for answering again. I've a Keystation mini 32, and I'm in the C3 octave, so that shouldn't be an issue. The Mellotron sample pack aldready has a definition.txt, so that shouldn't be it either. I read somewhere that the Pi sometimes doesn't work with old and/or crappy thumb drives, so I might try to buy a couple of new ones and see what happens. But that really feels like a hail mary...

AlexM posted May 14, 12:40:

Have you named your Mellotron folder "0 Mellotron"? If so, does the "0 Saw" sample-set work on your USB drive?

Jakob posted May 16, 12:44:

Hi again and thanks for your patience and help. I went and bought a couple of thumb drives this morning and did exactly what I did with the old one. AND IT WORKS NOW. (It's a 8GB Kingston DataTraveler 50, in case someone has the same problem as me.) Hell yeah!

AlexM posted May 16, 14:03:

Thanks for the update! What make was your old one?

Jakob posted May 17, 15:11:

It was an old Sandisk Cruzer. I think the problem might have been the pesky U3 virtual drive. Tried to uninstall it from a friend's PC (the U3 software is, of course, not Mac compatible), but the uninstaller broke down repeatedly. Might just have been that the thumb drive was way old, abused and corrupted...


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